Midbar is more than just an open source password vault!
OSI Layer 2 driver for nRF24L01 on Arduino & Raspberry Pi/Linux
Blynk library for embedded hardware
The KhadashPay project is an open-source payment system.
Experimental, arduino-compatible, multi-master, multi-media network
ESP8266 framework for Homie, a lightweight MQTT convention
MySensors library and examples
The serial LCD module using ATmega8 along with easy arduino library.