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I came across this site a long time ago.  It's awesome.  Only downside is that they currently don't host or demo any .NET frameworks (Rainbow Portal, DotNetNuke, etc.).  But, if you're willing to go the PHP route or something similar, it's a great site to look at.  It has online demos of tons of frameworks covering:

• Portals
• Blogs
• eCommerce Engines
• Wikis
• Groupware
• Forums
• etc.

One of my favorite portal options is Mambo.

http://www.opensourcecms.com/