I'll just do Cactloid and Cafe here, since my other UTAU's have only had one update at the most.
Cactloid, August 2011 (1.0)
Cactloid, October 2011 (2.0)
Cactloid, May 2012 (3.0)
Cafe Fonico, October 2011 (1.0)
Cafe, December 2011 (2.0)
Cafe, June 2012 (3.0) (This isn't the release...