Freehub is a Rails application created by the San Francisco Bike Kitchen to track members and visits to the shop in San Francisco.
It is built as a multi-tentant system and deployed at freehub.bikekitchen.org where it is also used by several other community bike shops.
The project home is github.com/asalant/freehub. For project details, support, developer guide and more see github.com/asalant/freehub/wiki.