You can still check out the source from Sourceforge , and you can look
here  for some guidance. But the code hasn't been touched for more than
3 years, and I would consider it abandoned. It's unclear if the code base
still works with a current Eclipse installation, and whether it provides
much beyond the standard JSDT/WTP you get from eclipse.org. It has never
been finalized, and was based on qooxdoo 0.7 anyway ...