Only the (scheme based) scripting language on top of which the automatic editing system is built is open source - https://github.com/srikumarks/muse . However, it's editing and effects engine is programmatically accessible within the application though, so you can make your own styles and even write programs to make specific compositions in case you don't want to use the automatic features. Documentation here - https://srikumarks.github.io/muvee-style-authoring/index.htm... .