Blue Cat's Freeware Pack includes six audio plugins in a single package. Blue Cat's Chorus gives a simulation of several voices. The Flanger plugin gives an alien-like audio effect. The FreqAnalyst is a spectrum analyzer. The Gain Suite plugin lets you control the volume of audio tracks. Phaser gives a vintage analog phasing effect. The Triple EQ is a filter with WYSIWYG customizable waveshape.
AAX plugins can be installed in Avid Protools audio/video editing program.