iToo Software have released version 2.2 of their RailClone plug-in for 3ds Max.
Ahmed Shalaby has posted a demo video of his upcoming tool for creating dynamic rigs in 3ds Max.
Free Rig for 3ds Max - Preview
Ahmed Shalaby has released another teaser for his upcoming free rig for 3ds Max.
Houdini Engine for Autodesk Maya
SideFX have released Houdini Engine for Maya, with 3ds Max and Unreal versions coming soon.