Calf Studio Gear is an audio plug-in pack for LV2 and JACK environments.
The suite contains lots of effects (delay, modulation, signal processing,
dynamics, distortion and mastering effects), instruments (SF2 player,
organ simulator and a monophonic synthesizer) and tools (analyzer,
mono/stereo tools). Calf Studio Gear aims for a professional audience. 

WWW: http://calf.sourceforge.net/