Scala is a freeware software application with versions supporting Windows, macOS, and Linux.
Scala is written in the Ada programming language, and is the work of Manuel Op de Coul of the Netherlands.
Because of its great flexibility when it comes to tuning formats, it is a very powerful tool for those who want to compose and sequence microtonal music.
Its logo is a Renaissance-style relief print of a cherub holding a compass and a globe inscribed with a diatonic musical scale and a circle of fourths.
The Scala site lists over thirty applications that support the format, including several major commercial packages like Apple Logic 7, Celemony Melodyne 3, and Cakewalk Rapture.