https://www.smartanim.com/

SmartAnim is a new advanced rigging and animation plugin for Autodesk 3ds Max. This powerful toolkit expands the current set of controllers, solvers, helpers, and rigging tools available within 3ds Max, allowing animators to create more complex and sophisticated animations than ever before. Whether working on a film, game, or other type of animation project, SmartAnim is a valuable addition to any animator's toolkit.