Codecha: CAPTCHA for coders
codecha.org
3 threads
It's an interesting idea. Unfortunately, it suffers from one flaw: http://imgur.com/Hc5agow
Yeah, they should have a time limit for the submitted code. Ironically, they are famous for www.spoj.com, a competitive programming website, where one of the measures of incorrect program is "time limit exceeded"
I'm also seeing a Polish version of the Facebook like button for some reason.
It is created by Sphere Research Labs, which is Poland based. They're mainly known for spoj.com, website for competitive programming.
Needs some info when runtime errors happen.
That would probably make it easier to solve with automation (though it might already be easy enough, I don't know.)