Context - Using old smartphones as stationary IoT devices
Node.js module for Termux-API
MQTT Client module for MagicMirror2
$4 Smarthome with ESP8266 and Firebase. Works with IFTTT, HomeKit (Siri), has a web app
A NodeJS wrapper library port to send data to Android devices via Google Cloud Messaging
An open-source framework for making universal native apps with React. Expo runs on Android, iOS, ...