.:: Bots United ::. - code search engine.

http://www.koders.com/

Quote:

Koders.com is the leading search engine for open source code. Our source code optimized search engine provides developers with an easy-to-use interface to search for source code examples and discover new open source projects which can be leveraged in their applications.

Note: this is for developers and not a place to find useful free software. If you are searching for something to use, see http://directory.fsf.org, http://sourceforge.net or http://freshmeat.net instead.