symmetry tool for modeling (more)
rotate around edges, move along them, etc... (more)
Select shortest edge-path by 2 vertices (more)
You can render in wireframe, just select the mesh(es) and apply it. (more)
Palette with handy scripts for working with meshes (more)
Tools for setup and maintenance of the Maya grid and cameras for creating and managing UDK assets. (more)
MmmmTools - Making Maya Faster And Easier To Use (more)
*Note: This is a downloadable item, not a physical product!