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StatusNet (formerly Laconica) is a microblogging service. Users post short (140 character) notices which are broadcast to their friends and fans using the Web, RSS, or instant messages. It is the software that runs Identi.ca.
Pidiblog is a simple yet capable microblogging system written in pure PHP (no SQL required!), focusing on easy installation and overall flexibility.
A microblogging tool. The development is under Bazaar for source control, and it is being used itself for tasks & bugs management. Check https://launchpad.net/sweetter
OpenMicroBlogger is the 2nd implementation of the http://openmicroblogging.org standard for distributed microblogging. Install it and subscribe/post notices via http://identi.ca or http://army.twit.tv and many other sites.