>OSS >- VisualTcl (for building Tcl/Tk apps) >- SpecTcl/Perl/Java almost the same >- Glade (for building Gtk apps in C) >- FreeBuilder (for Java, but I have not tried it) > >Non-OSS: > >- MetaCard (proprietary format) Non-OSS, but free WipeOut (for java, C/C++, & I think eiffel) (hopefully soon perl & python too)