Licences
MacSplat ships open-source software. The colmap program inside it is covered by the GNU GPL v3 / AGPL v3; msplat, MetalSplatter and the other components keep their own licences.
The full list of components, their versions, licences and every licence text: THIRD_PARTY_NOTICES.txt (the same file is inside the app, under Help › Acknowledgements, and in the disk image).
The complete source code of colmap and every library it uses: Source code.
This website uses React and Babel (MIT License): licence texts.