Natron is a visual effects composition software. It supports many common image file formats (EXR, DPX, TIFF, JPEG, PNG); colorspace management via OpenColorIO, and visual effects via OpenFX / OFX plugins. It has low hardware requirements that allow real-time playback, comes with command line tools, and uses Python3 for scripting.
MathMod is a mathematical modeling software to visualize and animate implicit and parametric surfaces, either with 3D or 4D hypersurface plotting. It provides JSON-compatible scripting facilities, OBJ and K3DSurf format export or .js conversion, ready-to-use animation algorithm examples, and includes a simple editor.
Synfig Studio is a 2D animation software. It allows for professional but uncomplicated film-quality animations, using vector graphics and bitmap artwork. Synfig doesn't require frame-by frame editing, but allows simple vector moving and shift editing, provides layer-based scenes, independent of target resolutions, brings smooth motion with high dynamic-range imaging, pentablet-aware tools, path-based gradients, filters, distortions, transformations, fractal views and other tools. It's also avail
AnimeEffects is a 2D keyframe animation tool based on deformation of polygon meshes. You can easily operate, quickly shape your idea, and remake at any time if you have changed your mind.
Lean & Mean Drag and Drop is a small script for dragging, dropping, sorting and reordering html structures
Inkscape is vector graphics software for creating icons, illustrations, logos, diagrams, maps and web graphics. It's cross-platform, extremely feature-rich yet simple to use, and extendable. Users therefore include design professionals as well as hobbyists. It's engineered around the open and standard SVG (Scalable Vector Graphics) format. Its sophisticated drawing tools easily match up to Adobe Illustrator, CorelDRAW and Xara Xtreme. Inkscape also can import and export to AI, Encapsulated/Posts
Tupi is a design and authoring tool for digital artists interested in 2D Animation, offering an interface experience focused on 8-100 years old kids.
APNG Assembler combines multiple PNG or TGA files into a squentially animated image in APNG format. It comes as command-line tool, or with a GUI for Windows, supports multiple color and palette optimizations, and can switch between zlib, 7zip and Zopfli compression.