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

A libre lightweight streaming front-end for Android.

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

The ZAP by Checkmarx Core project

Arduino IDE 1.x

☑️ [Cheatsheet] Tips and tricks for Android Development

Open Location Code is a library to generate short codes, called "plus codes", that can be used as digital addresses where street addresses don't exist.

A p2p, secure file storage, social network and application protocol

androrat

Separating data and state handling from Fragments or Activities without lots of boilerplate-code.

Turn your Android phone into Amateur Radio Codec2/OPUS APRS enabled DV handheld transceiver (Bluetooth/BLE/USB/TCPIP KISS/Sound modem client for DV digital voice communication)

Privacy Friendly App that shows active network connections of installed apps.

PX4/APM flight log plotter

Android Rtl/Sdr HackRF Tuner Sdr Rtl Rf spectrum

IRC-like messaging system for HAM packet radio with additional APRS support.

Android app that finds and displays Ham Radio Repeaters nearby