AudioThing has introduced FilterJam, a free multi-band resonant filter audio effect for Mac & Windows.
Filterjam is a multi-band resonant filter, designed to deliver weird ringmod-like filtered sounds. The input signal is divided into 4 bands that are then summed or multiplied together according to the selected mode.
Filterjam can be very harsh or gentle, it can add brightness or depth to synth sounds, but it can also completely mangle acoustic sources.
FilterJam is a free download from the AudioThing site (valid email required).