'Flow' movie was made with Blender, open-source just won an Oscar

Blender is an open source software for 3D modeling, rendering, animation, post-production, interactive creation and playback. Available for Windows, Linux, Irix, Sun Solaris, FreeBSD or macOS. Modeling A range of 3D object types including polygon meshes, NURBS surfaces, Bezier and B-spline curves, metaballs, vector fonts (TrueType, PostScript, OpenType) 'Smooth proxy' style catmull-clark subdivision surfaces Boolean mesh functions Animation Armature (skeleton) deformation with forward/inverse kinematics, auto skinning and interactive 3D paint for vertex weighting Non-linear animation mixer with automated walk cycles along paths Constraint system Vertex key framing for morphing, with controlling sliders Character animation pose editor Realtime 3D/game creation Graphical editor for defining interactive behavior without programming Collision detection and dynamics simulation Supports all OpenGL lighting modes, including transparencies, Animated and reflection-mapped textures ... Read full article.