ioBroker - flexible and modular application for the IoT and Smarthome
Reality Editor - MIT's new app lets you program any object
Nim Home Assistant (NimHA) - Nim Home Assistant is an open-source home automation platform running on Nim.
My Devices - Drag and drop IoT project builder for Raspberry Pi
Domoticz - Domoticz is a lightweight Home Automation System
PlatformIO - Next-generation IDE for IoT