Volt - Volt is a reactive web framework where Ruby code runs both on the server and the client (via opal).
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
Grid50 - The Marketplace for Photographers & Videographers
Meludia - Listening exercises and to sharpen your ear and music theory skills
KitSplit - Airbnb for creative equipment - rent cameras, drones & more
LenMus - LenMus is a free program for learning music.