To add tools to your library, just make a folder wherever you want them to be, go in Edit/Preferences/Projects/Library and add the path, it’ll go over it and populate the library with whatever it finds there!
To make your own tools, try adding a blank input and output nodes, and put something in between and expose some parameters:
So if you drop this substance inside another graph, it’ll have input and output plugs and some parameters you can tweak. Note that you can also add functions to control those parameters and whatnot. You can right click a node and open it up to see how it was made, try that too!
@Partikel It doesn’t solve problems that other tools wouldn’t be able to, it’s just a quick and fun tool to use to generate textures, kinda like Filter Forge, with really fast iteration. Since it’s a very complete solution you can bring in meshes, bake textures or masks out of them, you can paint bitmaps or draw vectors inside it as well. Supports up to 32 bit HDR, so you can even create IBL probes in it.