Subclipse
FindBugs
FreeMarker IDE (JBoss Tools version)
JadClipse
FlexBuilder
JRockit Mission Control
We also run MyEclipse 7.5 with JRockit 1.6.0 and real-time/deterministic garbage collection. JRocket seems to be very compatible with Sun’s JDK (looks like the source they’re using is mainly Sun’s source with modifications) and it is a major improvement in the responsiveness and memory consumption of MyEcilpse, and we don’t get low PermGen space warnings anymore since JRockit doesn’t use a PermGen area!