It is developed exclusively for [http://www.morphos.de/ MorphOS].<br />[[PulkoMandy]] is maintaining the port for [https://www.haiku-os.org/ Haiku].
Also worth mentioning is [[ACE-DL]], a derivative version of ACE with its unique strengths and available for Windows, macOS and Linux(implementing an old school minimalist SDL GUI only, also with no scripting or external plugins support).