Moho

Synfig Studio

Synfig Studio is a free, open-source 2D animation package that lets artists create vector-based animation without drawing every frame by hand. It uses tweening between keyframes across 50+ layer types (geometric shapes, gradients, filters, distortions, and fractals), and includes a full bone-based skeletal system for cutout-style character animation. Released under the GNU GPL v3 license, Synfig aims to give hobbyists and small studios an 'industrial-strength' animation tool without the licensing cost of commercial motion graphics software. It supports advanced parameter linking through mathematical expressions and mixes bitmap and vector artwork in the same scene, running on Windows, macOS, and Linux.

Rhino 3D

Rhino, developed by Robert McNeel & Associates, is a general-purpose 3D modeling application described by its maker as a jack-of-all-trades used across architecture, marine design, jewelry, industrial design, and film. It handles free-form NURBS surface modeling as well as newer SubD tools, letting users design, present, analyze, and prepare models for manufacturing or 3D printing. Rhino is sold as a one-time perpetual license rather than a subscription, with no required maintenance fees, and includes Grasshopper, a visual programming environment for generative and parametric design that has become widely used in architecture and computational design workflows.

Spine

Spine, made by Esoteric Software, is dedicated 2D skeletal animation software: artists rig flat artwork onto bones, apply mesh deformation and weighting, and pose characters with inverse kinematics rather than hand-drawing every frame. A dopesheet and ghosting tools support precise timing and motion review during animation. Animations export through Spine's own runtime libraries, which cover "nearly every major game toolkit and programming language," so a rig built once can be driven live inside a game rather than exported as baked video or sprite sheets. Spine runs on Windows, Mac, and Linux and is sold as perpetual Essential and Professional licenses, plus Enterprise and Education tiers.