Ghidra is a software reverse engineering (SRE) framework

Termux - a terminal emulator application for Android OS extendible by variety of packages.

A libre lightweight streaming front-end for Android.

Browse media content with your own rules on Android TV

Cryptomator for Windows, macOS, and Linux: Secure client-side encryption for your cloud storage, ensuring privacy and control over your data.

Free implementation of Play Services

A podcast manager for Android

OsmAnd

AIMSICD • Fight IMSI-Catcher, StingRay and silent SMS!

Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, IRC and many other useful features.

[Unmaintained] Open source two-factor authentication for Android

Distributed Peer-to-Peer Web Search Engine and Intranet Search Appliance

Modern super user interface implementation on Android.

AFWall+ (Android Firewall +) - iptables based firewall for Android

Android (f/w 2.1+) on screen keyboard for multiple languages.

Download apks from Google Play Store

OpenKeychain is an OpenPGP implementation for Android.

Android open source calendar

MicroG tweaked to work for applications such as Vanced.

An unofficial open source Android app for Reddit.

Android application for online privacy and security

Hacker's Keyboard (official)

📡 ☁️ 🎶Airsonic, a Free and Open Source community driven media server (fork of Subsonic and Libresonic)

Android ImageView widget with zoom and pan capabilities

Github client for Android

Open-source XMPP client for Android

c:geo - The powerful Android geocaching app.

No root required Android DNS modifier and Hosts/DNSMasq resolver.