Blender 2.78b (64-bit)

What's new in this version:

New design and complete overhaul, including:
- Easy layer management
- Ability to have multiple colors and thickness values per layer
- Stroke quality improvements
- Different color saturation in the same stroke
- Improved Fills - Support for Concave Shapes
- Parenting a layer to any object, armature or bone
- For Addon developers: See related Grease Pencil API Changes

Alembic:
- Initial implementation in Blender
- Basic Alembic support through import and export operators
- Data streaming through cache constraints and modifiers
- Cycles Renderer
- Rendering spherical stereo images for VR is now supported
- Multiscatter GGX mode for the glossy and glass BSDF nodes
- Experimental feature: Improved Subdivision and Displacement system
- Vertex color, weight and normal support for point density textures
- Hair rendering speed up / memory use improvements
- OpenCL devices now support float4 textures (e.g. HDR textures)
- Added support for NVidia GTX 1060, 1070, 1080 GPUs

User Interface:
- Improvements to the Eyedropper and Operator Search
- Additional drawing mode for the Waveform Scope in the Image Editor
- Defining ranges and individual render frames in the Command Line

Modeling:
- New Freehand Curve drawing tool
- New Dissolve tool
- New Fill Region tool for Selection
- Improvements to Decimation, Bevel
- Edit-mode undo memory usage has been optimized

Viewport & Render:
- More supported shading nodes and options for the Cycles viewport render
- Additional shading features for the Blender GLSL viewport
- Blender Render shading can now also be computed in world space

Animation:
- Improvements to Bendy Bones for Easier and Simpler Rigging
- Numerous changes to streamline the process of setting up and editing drivers
- The type of keyframe can be chosen on insertion
- Support non-uniform scaled bones failing with IK solver

Datablocks & Libraries Management:
- A new core low-level feature for datablocks management, called 'ID remapping'

Currently it allows from the Outliner:
- In the Blender File view to Reload and Relocate libraries
- In All Scenes, Current Scene and similar views to Fully Delete or Remap a datablock

Physics:
- The rest shape of cloth can now be animated
- Cloth Simulation Speed is now adjustable
- Collision Groups for Particles and Soft Body

Python API and Add-ons:
- 11 new add-ons are included in this release
- Numerous improvements and fixes to existing add-ons
- Removed Import: MakeHuman (.mhx) (format not supported anymore in MakeHuman)
- New Preferences Individual Activation
- Changes to the Python API functions

Bug Fixes:
- As for every Blender release, hundreds of bugs were fixed, thanks to the hardworking Blender developers