Ess r2 is a sound library that allows sound sample data to be loaded or streamed (AIFF, WAVE, AU, MP3), generated in real-time (sine, square, triangle and sawtooth waves, white and pink noise), manipulated (raw or via built-in filters), saved (AIFF, WAVE), analyzed (FFT) or simply played back.

Ess is built on JavaSound and as such requires no additional plug-ins, just Java 1.4 or better.