Developer Janos Buttgereit of Schrammel has released an open source audio effect plugin based on the Fulltone OCD distortion unit.
Built with the JUCE framework, the Schrammel OJD is heavily inspired by the schematics of the modern classic analog pedal.
Just add it to your FX chain before your digital amp simulation of choice and get that distortion sound that simply fits the mix perfectly.
Thanks goes out to my employer Sonible for supporting me with this project by supplying their infrastructure to build this plugin. Head over to the Sonible online shop and have a look at their great plugins as well.
The plugin is available to download for Windows and Mac under the GPL-3.0 license. VST3 and AU formats are currently supported, AAX is coming.
More information: Schrammel