PlatformIO - Next-generation IDE for IoT
My Devices - Drag and drop IoT project builder for Raspberry Pi
Modkit - Modkit is an open-source programming platform that allows programmers with a variety of backgrounds to share their creations and learn from each other and is allowing programmers to make beautiful software.
ioBroker - flexible and modular application for the IoT and Smarthome
ArduBlock - ArduBlock is a graphical programming language plugin specifically made for Arduino circuits and controllers.
Nim Home Assistant (NimHA) - Nim Home Assistant is an open-source home automation platform running on Nim.