this maker is quite cool and free/name your price
https://rodzilla.itch.io/material-maker
I exports as Unreal, it creates an image called _orm, this has AO, roughness and metallic in the rgba channels, if you use Gimp you can "Decompose" into the 3 images
https://rodzilla.itch.io/material-maker
I exports as Unreal, it creates an image called _orm, this has AO, roughness and metallic in the rgba channels, if you use Gimp you can "Decompose" into the 3 images