GIMP has supported editing all components of a path, converting to a selection, moving the entire path, and adjusting the handles, for a while. If I remember correctly, it was buggy until around GIMP 1.2.

The second half of the video on this page, after the "Direct Select" tool is chosen at 0:16, is completely doable in The GIMP.

http://shapeshed.com/journal/photoshop_101_path_and_direct_s...