Synfig is a free and open source 2D vector graphics and timeline-based computer animation program.
It is capable of simulating soft-shading using curved gradients within an area so that the animator doesnt have to draw shading into every single frame. There is also a wide variety of other real-time effects that can be applied to layers or groups of layers like radial blurs, color tweaks that all are resolution-independent. Other features include the ability to control and animate the width of lines at their individual control points, and the ability to link any related data from one object to another. Synfig also works with High Dynamic Range Imaging.
Synfig stores its animations in a non-standard xml-based-format, which includes natively vector graphics and additionally raster graphics, referenced to external stored bitmaps. Among several video formats like Digital Video, Avi, Theora and MPEG synfig can save to animated graphics like MNG and GIF. For best quality of the resulting output, it is also possible to render the video sequence into separate, numbered pictures like PNG, BMP, PPM and OpenEXR. With external programs, it is possible to convert SVG-files to the synfig native sif-format.
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