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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.
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.
Rizzoma is an online collaboration tool for small projects, ideal for teams of 5 to 25 people, providing a natural way of communication. The main advantage of this tool is an immediate generation of documents based on a discussion thread.