Estúdio Livre is the back end of the portal:
http://estudiolivre.org
it uses Tiki (https://www.ohloh.net/p/tikiwiki) as a base but enhances it with a lot of personalized code to allow for the use of Ajax interfaces, to create a free multimidia archive and to integrate with an icecast streaming
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server. Polvo is a sub-project that allows for seamless integration with Tiki's codebase. [Less]