There are dozens of DCCs where you have a UI where you stack things (over-compositing, bottom to top).

And when you select one of these things you can change the parameters.

If this is a 'slopfork' of shaders.com then the latter is a 'slopfork' of <insert any DCC that had this pattern and existed before and has whatever anyone may consider 'less sloppy'>.

OTTOMH: AfterEffects, Cavalry, Substance Designer's Layer panel, Tixl's layered textures, ...