Starting with this one.
Following plugin will let you import skeletons and few animation formats from all known Havok packfiles (hkx).
In addition, you can export your own skeletons and animations into Havok format.
Supported animation formats:
Here is animation exported into Havok format, inside Havok preview tool.
Here is Havok animation imported back to 3ds max.
Master page for 3ds max plugin.
Master page for Noesis plugin.
I will also require from you any and every feedback you can think of.
For plugin, you can create issues in repo.
For everything else here, or on blog.