Blender 2.59 (stable)

Interface

* Revolutionary non-overlapping and non-blocking UI delivers unsurpassed workflow
* Flexible and fully configurable window layout with as many screen setups as you prefer
* Undo support on all levels
* Anti-aliased fonts with international translation support
* Windows for animation curves/keys, outliner, schematic scene diagram, generic node editing system, non-linear video sequence editing, character animation action editor, non-linear animation mixer, image/UV editing, file/image selection and file management
* Built-in text editor for annotations and editing Python scripts
* Graphical user interface for Python scripts
* Custom themes
* Consistent interface across all platforms

Rigging

* Fast skeleton creation mode
* Interactive 3D paint for vertex weighting
* Fast envelope based skinning
* Mirror editing (bone creation and weight painting)
* Bone layers for better rig organization
* B-splines interpolated bones
* Constraint stack for IK solver setup and other constraints

Animation

* Armature (skeleton) deformation with forward/inverse kinematics
* Auto IK allows posing FK chains easily
* Non-linear animation editor for mixing individual actions created in Action editor
* Automated walkcycles along paths
* Animated constraint system
* Vertex key framing for morphing, with controlling sliders
* Edit and create new blendshapes from existing targets
* Character animation pose editor
* Animated deformers (Lattice, Curve)
* \`Ipo\` system integrates both motion curve and traditional key-frame editing
* Audio playback, mixing and editing support for sound synchronisation
* Timeline offers fast acces to many playback functions, autokey, help markers
* Python scripting access for custom and procedural animation effects

UV Unwrapping

* Conformal and Angle Based unwrapping methods
* Interactive transform of UV maps by vertex pinning