It looks pretty sparse. Try Signalgo or jein or the Intel Signal Processing Library, although I think the last one is just a JNI wrapper.
I saw a lot of those applets you were talking about. I think you may be able to get the JARs for them and use the class APIs inside. May have to use eclipse and jad to decompile and figure out what they do, though, due to lack of documentation. Try the source on this page for example.
