A Survey of Non-Rails Frameworks in Ruby

I think Roda[0] should also be on this list.

From its Github[1] page, it cites Cuba and Sinatra as inpiration[2].

[0]: http://roda.jeremyevans.net/

[1]: https://github.com/jeremyevans/roda

[2]: https://github.com/jeremyevans/roda#inspiration