Matthieu Brucher has released today ATKAutoSwell version.2, a free swell plugin for PC and Mac. It’s an open-source project and is based on the JUCE framework. ATKAutoSwell is a compressor that can compress the full signal not just above the threshold.
This plugin requires universal runtime libraries on Windows as per Microsoft recommendation (see the blog post for more details).
It’s available for Windows (32 & 64-bit) and Mac OS X (10.9 minimum) in VST2, VST3 and AU plug-in formats.
More information here: ATKAutoSwell V2