Volt - Volt is a reactive web framework where Ruby code runs both on the server and the client (via opal).
Fat Lama - Borrow stuff you need. Lend stuff you don't
Grid50 - The Marketplace for Photographers & Videographers
Daylui.com - Daylui is an "Airbnb for everyhing else".
Parachut - Netflix for camera gear
Idle - Rent Any Thing - A Peer-to-Peer Renting Community for Idle Goods