Winkl is a free foldback distortion for VST2, VST3 and Audio Unit plug-in formats. Winkl is not a subtle distortion, this is well suited for bass and leads, made to make scream your sounds.
Ourafilmes Facebook Free PACK is an exclusive pack with 19 VST effects, 4 VST synthesizers, Phat Waves (Reaktor synth), the last version of Invictus 1 – version 1.5 (until now an exclusive of the Native Instruments Reaktor Library) and a new and exclusive samplepack by Dr. Speaker Blower! VST plugins and Reaktor stuff. Note that this pack has exclusive creations in both VST (32 bit PC) and Reaktor 5 (PC/MAC) formats and the VSTs were tested on Win XP only (in Ableton Live). Reaktor synthesizers work fine in both PC and Mac.
Carve is a free VST, VST3, AudioUnit wave shaping distortion plugin with several available waveforms and two distortion units, which can be configured in serial, parallel, or stereo, and then blended with the dry sound.
RollAmp is a free guitar amp simulator for Windows and Mac.
Anaesthesia Distortion is a free Distortion / Filter vst effect plug-in with a shapeable filter.