Quanta Granular Synth, from Audio Damage, Inc., was updated with support for .TUN tuning files. These can be used to explore microtunings and other odd tunings. There are a lot of programs that let you create your own tuning files; including Scale Workshop, a free web app that lets you export tunings in a variety of formats.
What's new in Quanta Granular Synth v1.0.18:>> TUN file loading added to AUv3 version.
>> Fixed various small crashy bugs (mostly related to loading small samples or no sample at all.)
>> Fixed the MPE pitch bend override function so it does its one job correctly.
>> Updated the factory presets to fix the spelling of Marcus Fischer's name so he would stop complaining. (Requires complete deletion and re-install if this bothers you.)
>> Rebuilt with all current SDKs and libraries.