Pressure Mastering Compressor is a free compressor VST plugin developed by Gersic.com. Compatible OS(s): Windows.
Pressure Mastering Compressor uses a technique called upward compression; it increases the level of quiet portions in a mix without reducing the level of attack transients like a traditional compressor.
There are just 3 parameters: Amount of compression, look-ahead, and gain control.
http://www.gersic.com/