Five open source Web 2.0 applications

Blogs, wikis, social networks, social news aggregator. Although there's certainly been a lot of hype around these things, when applied in the right circumstances they can serve a utility for many people and businesses.

Fortunately, it doesn't cost an arm and a leg to get started building out your own Web 2.0 toolkit because there are free, open-source Web 2.0 applications that enable you to operate your own Web 2.0 services - for fun or for business.

Here are 5 of them:

• Chyrp is a lightweight open source blogging application modeled after Tumblr.
  
   
• Elgg is a social networking platform. Although I haven't yet tried it out, it looks very promising and it just had its 1.0 release.
  
   
• MediaWiki is the wiki software that was originally developed for Wikipedia.
  
   
• Pligg is the most popular Digg clone. It runs on PHP and MySQL.
  
   
• WordPress is one of the world's most popular blog publishing platforms and some of the most trafficked blogs on the internet run on it.

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