Materix is a directory and research layer for AI tools used in game development. It lists 41 tools, 17 game-focused and 24 general-purpose, and lets you browse by work: design and writing, code and debugging, characters and sprites, 3D and textures, localization, and marketing and release. Engine paths cover Godot, Unity, Unreal and Roblox.
It is free to browse. Listings carry pricing labels such as Free option, Paid plans, Usage-based and Free / open source, and send you to the vendor's official product page. Some listings state that features were not independently tested, so confirm terms with the vendor.
Game developers have a hard time comparing AI tools and their pricing and terms, so the team built one place that sorts them by the work they do.