There are 1 repository under rgbww topic.
Custom Board to control RGB + WW channels via Wifi utziling ESP8266
Firmware for esp_rgbww_controller (https://github.com/patrickjahns/esp_rgbww_controller) based on Sming framework
A homekit firmware for a magic home RGBW controller
A python library for the Sunix WiFi RGBW LED strip controller (HF-LPB100 chipset)
Homeassistant compatible MQTT Light implementation for RGB+CCT LEDs