IoTempire: Free and Educational IoT Software
IoT Empower was formerly called ulnoiot (You will know IoT).
iotempower is the brainchild of one of the founding authors (ulno) of IoTempire. It was initially envisioned as a pedagogical tool, but is slowly maturing into a competitive product and gains industrial relevance. Apart from having a strong focus on being easy to teach, it also has a strong focus on privacy and security. It allows to build IoT solutions which don't collect user data and are very resistant to attacks.