Vertex Painter
A Vertex Painting tool for Unity that allows you to paint colors, shading and blend with a texture inside the Editor.
The shader that handles texturing requires no UV's, because it samples the texture via the world positions and normals of each vertex.
There is a variant with a main color, transparancy and vertex colors which handles all shading and coloring inside the vertex shader. This saves massive performance on mobile (ignoring the need to sample textures).