If you want to find out about LibFX check out the wiki on GitHub. It has an article for each feature explaining the concept, giving some examples and pointing to the best resource in the code to get started.
Most key features also have self-contained demos, which can be found in their own source folder.
Finally, there’s extensive Javadoc under libfx.codefx.org/javadoc.
Getting LibFX 0.2.1
You can get LibFX 0.2.1 here:
LibFX is licensed under GLP 3.0 but other arrangements can be made – just shoot me an email.