Productivity
1843 open source Productivity apps
Notification Dictionary
APK
An app to access meaning of selected word as a notification. It works across all apps that support text selection. The apps shows the meaning as a notification for quick reference. Clicking on the notification user can see all the meanings for the given word. The user can also search for meaning of other words. * Easy access from all apps that have text selection. * Enabled for offline usage. * Supports English, French and German. * Click to copy meaning to clipboard. * Long press to share meanings with others. * Wide variety of meanings from Wikitionary. * Open source and MIT License.
F-DroidGitHub
Notification Plus
APK
Delivers recurring notifications via the phone's vibrator or notification ringtone. This is especially useful for phones which lack a notification LED, such as the Nexus S, and at least two of the Galaxy S variants.
F-Droid
NotificationLog
APK
NotificationLog logs the system notifications locally and allows to view, export and delete all of them or all of one App. It uses the notification access and the list of the installed Apps for this. At older Android versions which do not have the notification access permission, an accessibility service is used instead.
F-Droid
Notifications Recovery
APK
Review your most important notifications with Notifications Recovery. Notifications are saved on your device and you can search to find a particular one. Furthermore, Notifications Recovery reports the notifications it thinks have been deleted from the device.✅ Save Notifications – Automatically stores notifications received on your Android device.🔍 Search Notifications – Easily find past notifications using keywords.📂 Organized History – View notifications grouped by apps for better readability.🕒 Detailed Log – See timestamps, app names, and notification content.📊 Graphs – See some notifications' stats from graph.🔔 See Deleted Notifications – See notifications that were accidentally or automatically deleted.🌓 Dark Mode – Enjoy a sleek UI with dark mode support.🔒 Secure Access – Enable password or fingerprint authentication to access the app.
GitHubIzzyOnDroid
Notify Lite
APK
This application will display a popup window for missed calls, text messages, calendar events and emails via https://f-droid.org/packages/com.fsck.k9. It is extremely customizable with many options to suit your needs and style. Extra themes are available as apks from the website. Anti-feature: Addons. The app has some limitations and the user is prompted to install the fully-featured proprietary version. Status: Newer versions have been published by the author but without source code.
F-Droid
Nov Open Reader
APK
Nov Open Reader is a small application to read data from NFC insulin pens from Novo Nordisk : NovoPen 6 and NovoPen Echo Plus. Put the pen on the NFC reader of your phone to start retrieving its data, which will be simply displayed as a list. By default, doses within a one minute delay will be grouped as one, and first purging dose (2 units or less) will be hidden. Click on a grouped dose to display the details. Long click on the details to delete doses. Source code available at https://github.com/lcacheux/nov-open-reader This application is not developed or endorsed by Novo Nordisk. This application is intended for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding the use of insulin pens, diabete or any other medical condition.
F-DroidGitHub
NumberHub
APK
Calculator, converter and so much more!NumberHub will be installed as "Calculator" on your home screen.No ads or in-app purchasesOpen sourceCalculatorCopy, paste, save and share expression resultsTrigonometric functionsFractional outputUnit converterOver 500 units! Convert miles to kilometers, Dollar to Euro, Bytes to Gigabytes and so much more!Date calculatorAdd and subtract dates with easeTime converterConvert time zonesThe app uses https://github.com/fawazahmed0/currency-api by https://github.com/fawazahmed0 Requests are sent to cdn.jsdelivr.net.
GitHubIzzyOnDroid
N
Numerus
APK
Oral comprehension of numbers in foreign languages can be challenging. Here’s why: 1. Frequency of numbers in ordinary discourse is usually low, so learners struggle to develop a habit of listening to numbers. 2. Most words are easy to recognize due to context, whereas numbers are isolated. For example: With a population of 8 804 190, New York City is the most populated city in the US. The context helps only a little: you can guess millions, but thousands are essentially random. 3. Some languages construct numerals differently. For example, how to say 95: English: ninety five (90 5) German: fünfundneunzig (5 and 90) French: quatre-vingt-quinze (4-20-15) The best way to train comprehension is frequent exposure to numbers in real speech. This app provides that: 1. A random 10-second clip from a video plays and repeats. 2. The user types the number they heard and taps “check”. 3. Subtitles appear and the app shows whether the answer is correct. 4. The user taps “next” to continue.
F-DroidGitHub
Nuntius
APK
Nuntius delivers notifications from your phone or tablet to your computer over Bluetooth. To use Nuntius you will need to install a companion tool on your computer and pair your phone via Bluetooth. See the README for additional information.
F-DroidGitHub
Nutrixious
APK
An experimental and personnal application to manage foods and physical trainings without the need of having an online account. There are no ads and no paid services. Foods can be retrieved from Open Food Facts by text search or from barcode scanning (https://world.openfoodfacts.org/) It will allow you to follow your physical training and carry out calorie assessments by integrating nutritional management.
F-DroidGitHub
NymVPN – Anonymous No-Log VPN
APK
NymVPN: the world's most private VPN. A secure, decentralized, anonymous Swiss dVPN with no logs. WireGuard speed, Noise Generating Mixnet anonymity. No email signup. No ads. 🎁 7-DAY FREE VPN TRIAL & PLANS FROM $2.39/MONTH Try free for 7 days, no commitment. Pay in crypto, card, or cash: your choice. 🛡 PRIVACY BY DESIGN Most VPNs say 'no logs' as policy — they can log, they promise not to. Free VPNs track you to sell your data. NymVPN's architecture makes meaningful traffic logs impossible: our decentralized, anonymous network of servers routes your traffic through multiple hops, so no single server sees who you are AND what you do. Even Nym can't connect your identity to your activity. No logs to hand over: none to keep in the first place. ⚡ TWO VPN MODES, ONE APP • Fast Mode: AmneziaWG (WireGuard)-based 2-hop dVPN. Fast streaming and browsing on a decentralized network so no single operator can log you. • Anonymous Mode: 5-hop Noise Generating Mixnet, a more private successor to Tor. Routes your traffic through independently operated servers, mixes your packets with others, and adds noise and cover traffic to defeat traffic analysis. The most anonymous consumer VPN available today. Perfect for crypto, email, and private messaging like Signal. 💰 PAY ANONYMOUSLY WITH CRYPTO OR CASH NymVPN accepts more cryptocurrencies than any other VPN, plus cash payments. Pay with Bitcoin (BTC), Ethereum (ETH), Monero (XMR), Zcash (ZEC), USDT, USDC, NYM, and many more. Zero-knowledge credentials delink your payment from your VPN use: pay anonymously, use anonymously. 💎 WHY NYMVPN IS DIFFERENT • Zero-knowledge architecture: your identity invisible even to Nym • No logs by architecture: the network can't keep meaningful traffic logs • Decentralized proxy network: no central server can compromise or surveil your traffic • Swiss jurisdiction: outside the 14 Eyes, protected by strongest privacy laws in the world • WireGuard and mixnet protocols: a fast VPN + the most private way to be online • No email signup: no personal data required • Fully open source: audited by independent security researchers • 70+ countries: servers worldwide for global streaming and access • Up to 10 devices on one account 🔒 PRIVACY & SECURITY FEATURES • Built-in kill switch: automatic traffic stop if the VPN connection drops • Censorship resistance: prevent VPN blocking and access the global internet with QUIC, AmneziaWG, and other techniques • Multi-layer onion encryption • Entry & exit server selection • Split tunneling: route only the apps you choose through the VPN • Custom DNS: use any DNS server you trust • Ad and tracker blocker 🌍 WHAT YOU CAN DO WITH NYMVPN • Browse anonymously without leaving a trace • Encrypt your traffic on public wifi at airports, cafes, hotels • Bypass internet censorship in restrictive regions • Protect sensitive communications for journalism, activism, and research • Stop ISPs from profiling your browsing for ad targeting • Block malicious websites, trackers, and ads at the DNS level 🇨🇭 SWISS PRIVACY, BY DESIGN NymVPN operates under Swiss law, with the strongest privacy protections in the world. Switzerland sits outside the 14 Eyes surveillance alliance, with constitutionally protected privacy rights and no mandatory data retention. With a decentralized, no-logs architecture, your data is protected by both law and design, not by a promise. 🎓 BUILT BY ACADEMIC CRYPTOGRAPHERS NymVPN is built by Nym, trusted by journalists, activists, and privacy-conscious users worldwide. Our protocols are open-source and audited by independent security researchers. 🚫 WHAT WE DON'T DO • We don't ask for your email or your name • We can't track which sites you visit • We can't sell, share, or rent your data 📲 GET STARTED Download NymVPN, create an anonymous account without an email or even a name, and start browsing privately. Try NymVPN today.
F-DroidGitHub
NymVPN – Private VPN
APK
7 day free trial: All features, no ads, cancel anytime. The only VPN that can't spy on you. Made in Switzerland. Built by privacy-advocates. The world’s first mixnet for online anonymity. - NO NAME SIGNUP: No email required. Zero-knowledge accounts. The most crypto accepted by any VPN. Cash payments accepted for full anonymity. - DECENTRALIZED VPN technology - 65+ COUNTRIES with hundreds of independent servers - UP TO 10 DEVICES with one anonymous code BROWSE WITHOUT A TRACE Tired of wondering who's watching you? Corporations collecting your personal data? Not being able to access information because of where you are? While other VPNs promise not to keep logs, the NymVPN network is designed so centralized logs are not possible. No point on the decentralized network can connect your IP address with what you do online. Your privacy is guaranteed by default. When you connect with NymVPN, your online activity cannot be tied back to you by advertisers, network operators, or centralized infrastructure. You can browse, research, and communicate without creating a behavioral fingerprint that follows you across the internet. CHOOSE YOUR PRIVACY LEVEL Fast Mode - High-speed browsing and streaming - 2-hop decentralized VPN - Choose entry and exit servers in 65+ countries Anonymous Mode - Maximum anonymity for messaging, email, and financial transactions - 5-hop Noise Generating Mixnet - Designed to resist advanced traffic analysis ESSENTIAL FEATURES - High-speed connections with 65+ country selection - Multi-layer encryption - dVPN AmneziaWG (WireGuard) support - Kill switch prevents data leaks - Advanced anti-censorship technology - Split tunneling - Custom DNS - dApp & wallet mode for private & secure Ethereum crypto transactions - Key rotation for cryptographic security - Completely ad-free experience - Fully open source WHY NYMVPN IS DIFFERENT Most VPNs rely on centralized servers and ask you to trust their “no-logs” promises. NymVPN is built differently. - Decentralized VPN (dVPN) architecture: Traffic is routed through independently operated nodes. There is no single server that can see both who you are and what you do online. - Metadata protection, not just encryption: NymVPN protects traffic patterns, timing, and routing information. Even encrypted data can leak metadata. Nym is designed to prevent that. - Noise Generating Mixnet technology: In Anonymous Mode, your traffic is mixed with cover traffic across multiple hops, making correlation and AI-driven traffic analysis extremely difficult. - Two privacy modes, one app: Fast Mode uses a high-performance 2-hop decentralized VPN. Anonymous Mode uses a 5-hop mixnet for maximum anonymity. - Zero-knowledge accounts by design: No email signup. No personal data. Accounts are unlinkable from usage. Supports crypto and cash payments for full anonymity. - Censorship-resistant networking: Built with AmneziaWG, QUIC, and stealth transport options to work in restrictive environments. - Open-source and independently audited: Fully open source, with multiple third-party security audits by Cure53, Cryspen, Oak Security, and JP Aumasson. - Built by academic cryptographers: Designed by researchers from KU Leuven and EPFL with 20+ peer-reviewed publications in privacy and cryptography. INDEPENDENTLY VERIFIED - Audited by Cure53, Cryspen, Oak Security, JP Aumasson - Featured in PCMag, TechRadar, Forbes, Bloomberg - Trusted by 10,000+ privacy-focused users NYMVPN IS PERFECT FOR: - Streaming and browsing without being tracked by advertisers - Secure public WiFi connections at cafes, airports, hotels - Anyone in restrictive countries needing reliable access - People who want true anonymity, not just hidden IP addresses - Journalists and activists needing untraceable communication Download now. Signup anonymously. Go dark with NymVPN.
F-DroidGitHub
O
OCS-NG Agent
APK
Agent/Client for the Open Computers and Software Inventory. You will have a complete inventory of all your Android devices: hardware and software information will be collected and stored. Processors, memories, drives and space used, bios, serial number, installed applications and versions, SIM and operator information, … OCS Inventory Agent for Android send inventory to OCS Inventory NG Server 2.1 OCS Inventory NG project is an open source project providing: * hardware and software inventory (multiplatform) * network discovery (IP Discover and SNMP) * software deployment * interfaced with others IT and Asset Management Software througt the OCS WebService
F-DroidGitHub
OI About
APK
Some apps can use this app to provide "About" information.
F-DroidGitHub
OOS Firmware Extractor
APK
Extract firmware from an OxygenOS ROM to a custom flashable firmwareupdater.zip You can select a ROM file, unzip it, check extracted files and modified updater-script, then create a flashable firmware update at sdcard/firmwareupdater.zip
F-DroidGitHub
OSM Dashboard (Offline)
APK
Offline version of the OpenStreetMap dashboard for OpenTracks. Can be used as standalone GPX and location viewer as well. It shows a selected track with start- and endpoints on a map from OpenStreetMap based on the Mapsforge VTM library. This version only supports offline maps, which have to be downloaded manually. Join the OSM community and help to improve the map, see www.openstreetmap.org/fixthemap Some offline maps can be found here: - Mapsforge - Freizeitkarte Android - OpenAndroMaps Some maps require special themes to render correctly! These need to be downloaded and configured accordingly. Some browsers (e.g. Firefox) require a long click on the link and "Open link in external app" and then choose OSMDashboard. Manual downloaded offline maps or maps shared with other apps can be opened from your Android device. Select the directory in the menu "Map directory".
F-DroidIzzyOnDroid
OSM Dashboard for OpenTracks
APK
OpenStreetMap dashboard for OpenTracks. Can be used as standalone GPX and location viewer as well. It shows a selected track with start- and endpoints on a map from OpenStreetMap based on the Mapsforge VTM library. The default is an online map, but offline maps are supported as well. With offline maps, there is no necessity for a mobile data plan. The default map is provided by OpenStreetMap.org. Join the community and help to improve the map, see www.openstreetmap.org/fixthemap Please consider downloading an offline map to decrease the server load and save your mobile data plan. Some offline maps can be found here: - Mapsforge - Freizeitkarte Android - OpenAndroMaps Some maps require special themes to render correctly! These need to be downloaded and configured accordingly. Offline maps can be downloaded via the menu "Map download" or by visiting the above mentioned websites and click the download links. Some browsers (e.g. Firefox) require a long click on the link and "Open link in external app" and then choose OSMDashboard. Manual downloaded offline maps or maps shared with other apps can be opened from your Android device. Select the directory in the menu "Map directory".
F-DroidIzzyOnDroid
OSS Tracker
APK
Android OSS Release Tracker lets you keep track of updates to Open Source Applications directly from their resp. repositories. The application uses the QUERY_ALL_PACKAGES permission in order to fetch the currently installed version of each app in the tracker to compare against. * Subscribe to Android OSS repositories (GitHub and GitLab) * Compare versions with what you have installed on the device * Opens new version in browser for you to install yourself
F-DroidGitHub
OSS-Dict
APK
OSS‑Dict is a fast, privacy-friendly offline dictionary reader — a modern fork of Aard 2 with Material design and enhanced features for comfortable reading and lookup. Highlights * Blazing fast searches: punctuation, diacritics and case insensitive — find entries instantly. * Bookmarks & history: save and revisit important articles quickly. * Dictionary management: import, enable/disable and organize multiple dictionary files. * Customizable article appearance: add your own CSS to change fonts, colors and layout. * Beautiful math rendering: scalable, styleable formulas that look great on any screen. * Random article for discovery, volume-button navigation, and fullscreen reading mode. * Clipboard auto-paste and easy external link sharing for fast lookups from other apps. Why OSS‑Dict? OSS‑Dict is designed to work entirely offline — your dictionaries stay on your device for fast lookups and better privacy. It’s lightweight, configurable, and ideal for travelers, students, and anyone who needs reliable dictionary access without an internet connection. Network access The app requests the INTERNET permission for internal use by the built-in renderer and to open external links. This permission is not required for core dictionary lookups — the app functions offline with local dictionary files. Open source OSS‑Dict is open source and available on GitHub. Contributions, bug reports and feature requests are welcome. Get started Install or import your offline dictionaries, customize the look with CSS if you like, and start searching — fast and offline.
F-DroidGitHubIzzyOnDroid
ObjViewer
APK
Copy the .obj file that you want to view (and associated .mtl file, if any) onto a directory named “Models” on the SD card of the Android device. It should then appear in the list that is shown when you select “Open...” from the options menu in ObjViewer. You can interactively adjust the orientation of the object by dragging across the view; drag across the middle part to rotate about the X (horizontal) and Y (vertical) axes, and drag around the periphery to rotate about the Z axis (perpendicular to the view) as well.
F-DroidGitHub
Oblique Strategies
APK
A deck of cards. Over one hundred worthwhile dilemmas. Insights into creative processes. Gnomic challenges, constraints, and questions for you to interpret. First published by Brian Eno and Peter Schmidt in 1975, Oblique Strategies is a tool for working past creative blocks and reorienting (or disorienting) thought processes. This app presents you with a single strategy card at a time. - Swipe to reveal the next card. - Use the back button to bring previous cards back. - Create recurring notifications. - Favorites cards to change how frequently they occur.
F-DroidGitHub
Oblivion
APK
Oblivion is a security-focused Android application that allows a user to lock and wipe a device when a trigger is fired. The application is intended for high-risk situations such as device loss, forced unlock, or temporary loss of physical control. Trigger methods: * Panic button (Quick Settings tile) * Remote message containing a secret code * Trigger when the device has not been unlocked for a configurable period of time Actions: * Perform a factory reset (wipe) Device control is implemented using the Android Device Administration API. The has full support for GrapheneOS. Security notes: * Only encrypted (password protected) devices can guarantee that data cannot be recovered * The application does not function in Safe Mode License Free and Open Source Software GPL-3.0
F-Droid
Obscura VPN
APKDesktopiOS
Privacy-focused VPN with two-party architecture that makes logging impossible.
GitHub
Obsqr
APK
Fast and simple QR code scanner that uses the zbar library. Minimalistic design allows you to access QR content with a single tap. N.B QR codes only, not other kinds of barcodes. QR types that can be decoded by Obsqr: * URLs * phone numbers * SMS * geolocations * emails * contact information * applications on Play Store * WiFi configuration * plain text
F-DroidGitHub