Mixland freeTILT
$0Mixland freeTILT! is a tube EQ / saturation plugin.
Polyverse Wider
$0PSEUDO STEREO WIDENER WITHOUT PHASE ISSUES
Voxengo SPAN
$0SPAN is a free real-time “fast Fourier transform” audio spectrum analyzer AAX, AudioUnit, and VST plugin for professional sound and music production applications.
Xfer OTT
$0OTT (VST AU AAX) for Mac OS X & Windows