Soundhack - Freesound Bundle public beta 2 (Mac/Universal/Free)

From the homepage:

i am releasing five small plugins for the audiounit format, both ppc/10.3 and universal binary/10.4. these will eventually be offered in other formats (vst, rtas, windows) as well.

+chebyshev is a distortion unit which uses various low-order chebyshev polynomials to add even or odd harmonic distortion.

+compand is a combined compressor/expander audio unit plugin. It has a softknee control as well as a switchable rms/peak level detector.

+decimate - bit depth and sample rate reduction for added aliasing and decimation noise. a very noisy plugin.

+matrix - a mid-side to left-right encoder and decoder. for mid-side microphone arrays, but also useful when needing to apply effects to only the center or the sides of a stereo mix.

+phasescope - the standard studio tool for seeing the phase relation between your left and right channels.