Looking for cool Open Source Ruby on Rails apps
I’m looking for interesting Open Source Ruby on Rails applications. I know of a few, and I’m aware of the list on the Rails Wiki but I know there are others around that aren’t listed there. Here’s some that are on my radar.
If you know of any others that are interesting please leave a comment.

StoryTracker - XP story tracking - http://projects.folklogic.net/storytracker
Velakor - Note Taking app - http://velakor.com/
Informl - Wiki - http://informl.folklogic.net/doc
Feedmarker - delicious clone - http://www.feedmarker.com/
SimpleTicket - trouble ticket system - http://www.simpleticket.net/
Gitorious, we are considering adding git at work in addition to svn, so final checkin of code is subversion, but each developer has Gitand Gitorious to help keep track of whats going on.
Radiant CMS
Insoshi: Open source social network.
Not Rails, but cool: Laconi.ca
Several projects at http://www.fiveruns.org.
FiveRuns TuneUp - Rails Application profiler & free service - http://tuneup.fiveruns.com
Instrument - Simple Ruby instrumentation - http://blog.fiveruns.com/2008/5/22/introducing-instrument
DataFabric - Database sharding library for ActiveRecord - http://blog.fiveruns.com/2008/7/9/introducing-data_fabric
Why specially Rails?
No love for Ramaze or Merb?
Are there any decent quality full apps for either of those frameworks?