Marathon Shape Editors
Marathon Shape Editor (MSE) - Pretty simple to use and gets right to the point. Not many functions beyond copying & pasting are available. Supports CLUT editing
MSE was found at: AMUG, America Online
Marathon Shape Installer (MSI) - Although more advanced than MSE, it crashes a lot more. Supports shape animation. Still in beta stages.
MSI was found at: AMUG
Pfhred - Although it is also still in development, Pfhred seems to be the furthest along among all of them. It features shape animation, sophisticated coordinates, clut editing, and more
Pfhred was found at: AMUG, Info-mac