ATKStereoCompressor is a free VST stereo compressor which can work on two channels, left/right or middle/side, possibly in linked mode (only one set of parameters), and can be set up to mix the input signal with the compressed signal (serial/parallel compression).
The supported formats are:
- VST2 (32bits/64bits on Windows, 64bits on OS X)
- VST3 (32bits/64bits on Windows, 64bits on OS X)
- Audio Unit (64bits, OS X)