OpenSimis a powerful and freely available tool for modeling and simulation of movement.
KineBody.com: Movable 3D Human Modelis an easy-to-use app for creating expressive human poses and animations, and for learning about human joints and movement.
The Biomechanics of Bodies (BoB) Softwareis a family of biomechanical modelling software packages combining a human musculoskeletal model with an easy to use, intuitive interface and powerful analysis functionality resulting in quantitative, objective information.
modenaxe/awesome-biomechanicsA curated, public list collecting resources for biomechanics and human motion: datasets, processing tools, software for simulation, educational videos, lectures, etc.