Scala: http://www.huygens-fokker.org/scala/index.html
A powerfool tool programmed by Manuel op de Coul, for the experimentation, creation, editing, comparison, analysis, storage, digital adjustment, and MIDI sounding and recording of Western & non-Western, just intonation, equal, microtonal, and macrotonal tunings. SCALA is accompanied by a library of more than three thousand scales, is free of charge, and is downloadable from the internet.
I came across it while reading Ozan Yarman‘s Doctoral Dissertation, 79-tone Tuning & Theory For Turkish Maqam Music (from where the comment about Scala above is quoted).