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

A libre lightweight streaming front-end for Android.

Open-source IoT Platform - Device management, data collection, processing and visualization.

Implementation of ImageView for Android that supports zooming, by various touch gestures.

High Performance Inter-Thread Messaging Library

QuestDB is a high performance, open-source, time-series database

OpenRefine is a free, open source power tool for working with messy data and improving it

Free implementation of Play Services

Gnirehtet provides reverse tethering for Android

smali/baksmali

Android Unit Testing Framework

Install and run GNU/Linux on Android

OsmAnd

Vitamio for Android

Text editor - Notes & ToDo (for Android) - Markdown, todo.txt, plaintext, math, ..

Application for Mind Mapping, Knowledge Management, Project Management. Develop, organize and communicate your ideas and knowledge in the most effective way.

No-root network monitor, firewall and PCAP dumper for Android

an open source geocoder for openstreetmap data

Android backup extractor

Simplenote for Android

PySonar2: a semantic indexer for Python with interprocedual type inference

An awesome code differencing tool

Integrated Development Environment (IDE) for ESP8266 developers

Alternative network location provider for Android, with plugin interface to easily integrate third-party location providers.

Ahead of time compiler for JVM bytecode targetting iOS, Mac OSX and Linux

Read data from public transit cards using your NFC Android phone!

Manage applets and keys on JavaCard-s like a pro 🌐 🔐

Android superuser permissions app (from Zinx)

A robust parser for C/C++ storing abstract syntax trees, control flow graphs and program dependence graphs in a neo4j graph database.

Vespucci is a OpenStreetMap editor for Android