Gob is a project mainly written in Ruby, it's free.
A proof-of-concept Sinatra application which uses it's own REST API as a domain layer.
A narcissistic, trick illusion-performing web application which talks
to itself. Also, it might do something useful eventually.
Gob: [talking about his new boat] The Seaward!
Michael: You're not getting a boat.
Gob: [doing rock, paper, scissors] One, two, three...
Michael: You're not going to do it. [does rock]
Gob: Paper covers rock.
Michael: Fine, but rock sinks boat.
Lucille: [entering room] Michael...
Michael: Just a minute mom.
Michael: [to Gob] Get rid of the Seaward.
Lucille: I'll leave when I'm good and ready.