Animation

Creating Animation and Manipulating Keyframes
advanceToNextDrivenKey 
animCurveEditor
animDisplay
animView
autoKeyframe
bakeResults
bakeSimulation
blendTwoAttr
bufferCurve
buildBookmarkMenu
buildKeyframeMenu
choice
copyKey
currentTime
curveRGBColor
cutKey
dopeSheetEditor
filterCurve
findAnimCurves 
findKeyframe
flow
hikGlobals
isAnimCurve 
keyframe
keyframeOutliner
keyframeStats
keyingGroup
keyTangent
listAnimatable
makeRoll 
marker
movieInfo
mute
nextOrPreviousFrame 
pairBlend
pasteKey
pathAnimation
play
playbackOptions
playblast
retarget
rotationInterpolation
scaleKey
sceneTimeWarp 
setDrivenKeyframe
setInfinity
setKeyframe
setKeyframeBlendshapeTargetWts
setKeyPath
simplify
snapKey
snapshot
snapshotBeadCtx
snapshotModifyKeyCtx
sound
timeWarp

Deformation

Object Deformation
blendShape
blendShapeEditor
blendShapePanel
cluster
copyDeformerWeights
deformer
dropoffLocator
findRelatedDeformer 
getAllChains 
getChain 
lattice
nonLinear
percent
reorderDeformers
sculpt
softMod
textureDeformer
wire
wrinkle

Skinning

Skinning
bindSkin
boneLattice
copySkinWeights
dagPose
findRelatedSkinCluster 
geomBind
gotoBindPose 
jointLattice
polyUniteSkinned
skinCluster
skinPercent
volumeBind

Constraints

Constraints
aimConstraint
orientConstraint
parentConstraint
pointConstraint
setConstraintRestPosition 

IK

Joints, Handles, and Skeletons
characterize
effector
ikfkDisplayMethod
ikHandle
ikHandleDisplayScale
ikSolver
ikSystem
ikSystemInfo
insertJoint
joint
jointCluster
jointDisplayScale
mirrorJoint
moveIKtoFK 
poleVectorConstraint