grANALiser is a free hybrid of granulator and delay VST plugin capable of complex FSU sounds and effects as well as chorus, pitch-shifter or ring modulation. It is build around the same morphing engine as our redu(p)cer plugin.
GrainMaker is a free 32-bit VST plugin for granular processing. Lots of modulation options.
Argotlunar is a free realtime delay-line granulator VST / AU plugin. It breaks up an incoming audio stream into short samples (Grains). Each grain can have random settings of amplitude, panning, duration, delay, pitch, glissando, filter and envelope. The output of all grains is mixed and sent to the main output. The main output can be fed back into the main input.