Emiliano Grilli,
I think blender is one of the shiniest examples of a
very good interface,
and of the power of the community behind it: a real "symbol" of open source
software (with the literal "liberation" to GPL!!!)
It's only been open source for a few months. I think it's a great testament
to what someone can do if they don't accept the accepted... think for
themselves, all that...
Don't forget who wrote it.