Back in 2015, CD Projekt released MODKit for The Witcher 3: Wild Hunt, a mod tool that "enables [the] Witcher community to modify several aspects of the game to their own liking." As we noted at the time, however, it's not the mod tool: That'd be REDkit, a far more powerful piece of software that lets users create entirely new things in the game, rather than simply changing up what's already there...
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It took almost 10 years, but REDkit modding tools are finally coming to The Witcher 3 and a test version on Steam is live now
Source: PC Gamer (opens in a new tab)