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http://noostr.com/download/ :) The version there does have a number of bugs and unfinished features though, it's still beta-quality.

Check out http://sourceforge.net/

Can you give precise examples?

Joking?! There are tons of open source projects hosted on that site. As on github. Use the categories to browse them. Use the search engine to search for them.

To answer your question: No.

or http://www.github.com

Ask HN: Web apps source code?