CAPS (LADSPA)
The C* Audio Plugin Suite (CAPS) comprises a range of classic sound effects and a few more basic audio DSP units, signal and noise generators.
The suite's aim is to provide impeccable sound quality, computational efficiency and no perceptible latency.
Homepage and Documentation: http://quitte.de/dsp/caps.html

REV-Plugins (LADSPA)
Reverb LADSPA plugins.
Includes a stereo reverb plugin based on the well-known greverb, and LADSPA versions of zita-rev1 in resp. stereo and first order Ambisonic mode.
Homepage: http://kokkinizita.linuxaudio.org/linuxaudio/index.html