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Free open source projection mappers
MapmapMapMap
https://mapmapteam.github.io
TouchDesigner (free for non-commercial use)
https://derivative.ca
Digital Pressworks
https://www.digitalpressworks.com/free-mapping-software/
VPT
https://hcgilje.wordpress.com/vpt/
Splash
https://splashmapper.xyz/en/
https://github.com/paperManu/splash
Syphon
httphttps://syphon.v002github.infoio/