This Almost 10-Year-Old Free Tool For Creating PBR Materials From Photos Is Still Great
Try Materialize.
If you're only getting into 3D art, or you're just hunting for resources and feeling overwhelmed by services pushing AI toolsets, there's actually a solid option worth knowing about: Materialize. It's a tool for creating game-ready materials, released by Bounding Box Software back in 2018, and it's still widely used by many people.
Materialize is free, open-source, and pretty much straightforward to use. The software converts a source image step-by-step into the texture maps required for a PBR workflow, which you can then refine using a slider-based interface. Results can be previewed in real-time on a 3D model in the viewport, and once you're happy, the textures can be exported in a variety of file formats.
You can download Materialize here.
Another free tool you might find interesting is Material Maker. It lets you create PBR materials using node-based graphs that generate and transform textures, with easy export for game engines:
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