Wiki / Run your own identity server. Shindig - Welcome To Apache Shindig! OpenSocial - It's Open. It's Social. It's up to you. People on different networks following each other. I’d like to take the maintenance of ostatus.org content out of my own incapable hands, and make it more accessible through this community group. ostatus.org itself consists of a Drupal-based blog with <10 posts plus a copy of the spec.
I believe it can be pretty easily transferred to the community group sites here, which run on WordPress. wiki.ostatus.org is a MediaWiki wiki. The Appleseed Project - Open Source Social Networking.