Unfortunately XForms has not really taken off in open source land, quite a few commercial implementations.
[blyth@belle7 Scraper]$ java -version
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Server VM (build 17.1-b03, mixed mode)
[blyth@cms01 ~]$ java -version
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) Server VM (build 20.6-b01, mixed mode)
b2mc:~ heprez$ java -version
java version "1.6.0_35"
Java(TM) SE Runtime Environment (build 1.6.0_35-b10-428-11M3811)
Java HotSpot(TM) 64-Bit Server VM (build 20.10-b01-428, mixed mode)
The betterFORM project has released a new version (3.1) of its XForms-based toolkit, with a focus on the combination of eXistDB with betterFORM to provide a complete platform for developing XRX (XForms REST XQuery) applications that use XML technologies from front to back. An graphical installer makes it easy to quickly get started.
Chiba is(was) a webapp for editing XML instances of XSD schema via XForms where the XForms are generated from XSD. Albeit with considerable (and painful) XSLT fixups by me.
Not very keen on eclipse interface (the modern emacs kitchensink)