secondaryMotion()
creates seconday motion for the selected joint hierarchy
It basically creates a softbody replica of the selected joint hierarchy and keys the transformations based on this replica. when done, it backs up the original animation curves, and connects the new motion back to selected joints. you can revert back to original keyframe animation whenever you need and re-run the simulation.
It is designed to work under very complex situations like locked channels, character sets etc., so you can use it on any character/creature rig without breaking apart the rig itself.

copyVertex.mll |PLUGIN [maya8.x] [maya6.x]
does the same job as copyVertex.mel script but the plugin version compiled for maya8.5. runs extremelly fast.

AddJoint( int )
Adds given number of joints to the selected joint. Pick the joint you wanted to add joints to and run script as; addJoint ( numOfJoints)

copyVertex()
copies the selected vertex positions to other selected same topology meshes. Usefull for working with blendshapes and copying partial face deformations between meshes.

layoutEditor()
layoutEditor lets you create a squence`s layout by setting the shooting angles and timings in a single Maya scene with a continuous camera throughout the sequence. So you can easily edit the layout, change its timings, playblast a full sequence, or export each shot to individual Maya scenes for animating. For detailed information check out this page