Thump by Metric Halo is a percussive subsonic synth. It takes the signal of the source audio and adds a synth bass to the audio. This is a very useful plugin for anyone looking for more bottom end out of their source. It can be blended with a kick drum or any other percussive source to add weight and dimension, or give an electronic vibe to a source.
Thump is Mac and PC compatible and comes in 32 & 64 bit AU & VST formats! It was originally only available as a 64bit AAX plugin, but AU & VST support was just added this week. Download for free at http://mhsecure.com