MdspCompressor is a free compressor VST, Audio Unit plugin developed by Smart Electronix. Compatible OS(s): Windows 64b, macOS.
by mdsp of Smart Electronix
mdspCompressor is a simple compressor with auto-make-up gain as well as a preamp gain to overdrive it as much as you want.
A separate sidechain version is also available for Windows – with 3 inlets, the third one being the side-chain.
http://www.smartelectronix.com/