Ramaze - Ramaze is a very simple and straight-forward web-framework.
Grid50 - The Marketplace for Photographers & Videographers
Cuba - Cuba is a Ruby microframework for web development.
Wedio - Your Local Camera Sharing Community
Scorched - Scorched is a generic, unopinionated, DRY, light-weight web framework for Ruby.
KitSplit - Airbnb for creative equipment - rent cameras, drones & more