Poetica Mechanica is a single-person company devoted to developing interesting tools, models, scripts, particle effects, shaders, and whatever else for fellow indie developers. It specializes in assets for VRChat, but many are usable in most any Unity project.
Its founder, WaffleSlapper (aka Steeveeo, or just Steve), is a freelance developer known for such projects as Actium Knights, Blackwell, and VRChat Twitch Integration (VTI).