open source alternatives to popular websites

Posted by Richard on Stack Overflow See other posts from Stack Overflow or by Richard
Published on 2009-10-28T00:57:09Z Indexed on 2010/04/23 1:23 UTC
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Hello,

The other day I came across Jaiku, which is a well structured microblogging system open sourced by Google.

It surprised me I had never heard about this, so I was wondering what other open source alternatives exist for mainstream websites?

I am not asking about forums, eCommerce, wiki's, CMS's, etc, where the market leaders are already well known open source applications (phpBB, osCommerce, Mediawiki, Drupal).

But what about open source alternatives for:

Social networking (Facebook)?
Classified advertising (Craigslist)?
Jobs (CareerBuilder)?
Dating (eHarmony)?

Or any other field that is defined by a commercial website, as Twitter does for microblogging.

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