Free browser tool that adds real, printable surface textures to a model: wood grain, knurling, leather or your own image. It accepts STL, OBJ, 3MF and STEP and exports a displaced mesh, so the texture prints on any printer and slicer. Textures can also hide Z-seams and improve grip.
BumpMesh was created by Stefan Hermann of CNC Kitchen. It's open source, runs locally in your browser, and is part of his set of free web apps that also includes Model Spiralizer.