arendst / Tasmota

Alternative open-source firmware for ESP8266 and ESP32 devices, configurable via web UI and controllable locally over MQTT, HTTP, Serial or KNX.

emqx / emqx

Scalable MQTT broker and IoT messaging platform supporting MQTT 5.0, CoAP, LwM2M, and MQTT over QUIC, with a SQL rule engine and data bridges.