Web systems

see bits of Communication

Blogging

• https://github.com/iamues/Simvla-Network

Wiki

See MediaWiki

• http://wikiindex.org/Welcome

• http://gitit.net/

• http://tiddlywiki.com/

Forum

• https://www.phpbb.com/downloads/

CRM

• http://www.sugarcrm.com/community

Other

• http://www.redmine.org/

• http://www.magentocommerce.com/

• http://oscommerce.com/
  • https://github.com/osCommerce/oscommerce2
  • demo

• https://github.com/rigoneri/syte

• http://news.ycombinator.com/item?id=4857473

Social news

• http://slashcode.com/ - shashdot
• http://scoopdev.org/ - kuro5hin

• http://code.reddit.com/

• http://telesc.pe/