Padrino was created and open-sourced in 2010. The framework was originally created by Nathan Esquenazi, Davide D'Agostino and Arthur Chiu based on the prior sinatra_more gem. The framework was created in order to extend Sinatra to more easily support rich web applications. Padrino, as of March 2013, has 7 developers that comprise the core development team.
Logging: Provide a unified logger that can interact with your ORM or any library.
Reloading: Automatically reloads server code during development.
Localization: Full support of I18n
Note that as a user of Padrino, each of the major components can be pulled in separately to an existing Sinatra application or they can be used altogether for a comprehensive upgrade to Sinatra (a full-stack Padrino application).