Railsbased.org

reusable applications built with Ruby on Rails

Sinatra

Category: Microframework

Sinatra is a very lightweight and fast Micro- Web Framework that uses a simple DSL.
An entire application can be written in one file. It is thread safe and is not bound to a specific ORM,+ so you can use whatever you want (eg. ActiveRecord, DBI, Sequel,...)

Website: Sinatra Microframework