PreEmptive's DashO optimizer (http://www.preemptive.com)
TowerJ environment (compiler & runtime) from Tower Technology Corporation (http://www.towerj.com)
TowerJ review (http://www.javaworld.com/javaworld/jw-10-1999/jw-10-volano_p.html)
JOVE (http://www.instantiations.com/jove/)
Condensity from Plumb Design (http://www.condensity.com)
JAX size optimizer from IBM alphaWorks (http://www.alphaworks.ibm.com/tech/jax/)
jres resource manager and compressor from IBM alphaWorks (http://www.alphaworks.ibm.com/jres/)
Jshrink size optimizer from Eastridge Technology (http://www.e-t.com/jshrink.html)