dict.cc is not only an online dictionary translating from English and German to 21 languages. Its an attempt to create a platform where users from all over the world can share their knowledge in the field of translations.
Shelter is a Free and Open-Source (FOSS) app that leverages the “Work Profile” feature of Android to provide an isolated space that you can install or clone apps into.
FlorisBoard is an open-source keyboard aimed at providing you with an easy way to type while respecting your privacy.
Help to improve the OpenStreetMap with StreetComplete by completing quests which consists of simple questions about the world around you.
Öffi is an Android app that tells you where and when trains and buses go, including delays and replacement bus services for more and more transport authorities in Europe and worldwide.
DroidFS is an alternative way to use encrypted overlay filesystems on Android that uses its own internal file explorer instead of mounting virtual volumes. It currently only works with gocryptfs but support for CryFS could be added in the future.
Navigation app with offline and online OSM maps, turn-by-turn voice guidance, cycling and driving modes, GPX tracking, POI search, and monthly updates.
FitoTrack is a mobile app for logging and viewing your workouts. Whether you’re running, cycling or hiking, FitoTrack will show you the most important information, with detailed charts and statistics. It is open-source and completely ad-free.
This app collects GPS locations of GSM/UMTS/LTE/CDMA cell towers and sends them to OpenCellID.org database. It is designed to help map the extent of mobile phone network coverage. It is also possible to collect measurements for private purposes and export them to CSV or GPX...
Lightweight Android client for decentralized social networking, featuring material design, support for photo, video, emoji, lists, drafts, notifications, multiple themes and timelines.
PixelDroid is a Free and Open Source Android client for 
Pixelfed, the federated image sharing platform.
Protect your communication in transit and on your phone. Silence (formerly SMSSecure) is a full replacement for the default text messaging application: all messages are encrypted locally and messages to other Silence users are encrypted over the air.
PanicTrigger is an Android app which can help you in case of an emergency situation. In case of an emergency you tap on a big red button which causes the app to send out SMS to your preconfigured contacts without confirmation.
Calculator-inator is a Calculator & Converter for Android inspired from 
Google Calculator
SchildiChat is a Matrix client based on Element with a more traditional instant messaging experience.
Kotlin Multiplatform Music Downloader, Supports Spotify / Gaana / Youtube Music / Jio Saavn.
