FengGUI was still being developed past that - I was submitting patches until about Jan 2010, when I left the company where I was using it, and there were a handful of other active forum users. But it did suffer from a main developer (possibly the previous one - my memory’s hazy on the details) who didn’t know how to use SVN branches, so decided to start a massive refactor in the trunk and then left it half-finished.
There should be a few examples which demonstrate how to use it with LWJGL, but if there’s another library which meets your requirements I would try that first.
Ok, thank you for these pieces of information. Please feel free to create another thread to tell us more about your new library. I would have loved to use PureSwing with another backend based on Agile2D.