If you absolutely need a completely free tool with saving capabilities, consider open-source projection mapping tools like Mapio (lite versions) or specialized patches within Pure Data or VVVV .
Search volume for "mad mapper free free" spikes every September (when school starts) and January (New Year’s resolutions). Here is the hard truth for digital artists: mad mapper free free
For students and hobbyists mapping for personal enjoyment, the free demo is sufficient. For professionals ready to save projects and run shows without watermarks, the rental or perpetual license is an investment in a tool widely considered the "Queen of Mapping" for a reason. If you absolutely need a completely free tool