Not free software, though, sadly.
"This CMYK print emulation is free but the creator accepts your support by letting you pay what you think is fair for the CMYK print emulation."
Licensing:
"Basic" version license: MRMO-Halftone "Basic" version can be used in non-commercial projects of any kind, excluding those relating to or containing non-fungible tokens ("NFT") or blockchain-related projects. You can modify it to suit your needs. You may not redistribute, or resell it, even if modified. Credit is not necessary, but very much appreciated.
"Deluxe" version license: MRMO-Halftone "Deluxe" version can be used in both non-commercial and commercial projects of any kind, excluding those relating to or containing non-fungible tokens ("NFT") or blockchain-related projects. You can modify them to suit your needs. You may not redistribute, or resell them, even if modified. Credit is not necessary, but very much appreciated.