PX4 has moved to http://slack.px4.io/
916MHz to BLE bridge hardware and firmware
Lua based interactive firmware for ESP8266/ESP32
SuperWRT - https://superwrt.download - Discord https://discord.gg/Qv84R2R
Firmware for the superbit open source radio system.
Agent/Device Firmware Pair for Electric Imp. Use with Imp-IO for Johnny-Five
A firmware for the STM32VLDiscovery board (STM32F100RB), for reading sd cards using SPI