Animation

Creating Animation and Manipulating Keyframes
advanceToNextDrivenKey 
animCurveEditor
animDisplay
animLayer
animView
autoKeyframe
bakeClip
bakeResults
bakeSimulation
blendTwoAttr
bufferCurve
buildBookmarkMenu
buildKeyframeMenu
character
characterMap
choice
clip
clipEditor
clipMatching
clipSchedule
clipSchedulerOutliner
clipTrimBefore 
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
pose
retarget
rotationInterpolation
scaleKey
sceneTimeWarp 
sequenceManager
setDrivenKeyframe
setInfinity
setKeyframe
setKeyframeBlendshapeTargetWts
setKeyPath
shot
shotRipple
simplify
snapKey
snapshot
snapshotBeadCtx
snapshotModifyKeyCtx
sound
timeWarp
ubercam

Deformation

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

Skinning

Skinning
bindSkin
boneLattice
copyFlexor
copySkinWeights
dagPose
findRelatedSkinCluster 
flexor
gotoBindPose 
jointLattice
skinCluster
skinPercent
substituteGeometry
volumeBind

Constraints

Constraints
aimConstraint
geometryConstraint
normalConstraint
orientConstraint
parentConstraint
pointConstraint
pointOnPolyConstraint
scaleConstraint
setConstraintRestPosition 
tangentConstraint

IK

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

MoCap

Motion Capture
applyTake
defineDataServer
defineVirtualDevice
deviceManager
enableDevice
filter
movIn
movOut
readTake
recordDevice
writeTake