I thought i would let you know about a couple of free VST sonic enhancers released on my site.
Basically, there are inspired by hardware processors like BBE & others(2 bands exciters), and were released on the Reaper forum as JS plugins.
Bodan from Element plugin compiled then as native plugin for Windows and Mac, available as 32 & 64bit, with vumeters and oversampling.
I made a very simple GUI for the red one.
Both plugins are available at no cost.
More info: Sonic Enhancer and Sonic Maximizer