Synfig Studio is a free and open-source 2D animation software, designed as powerful industrial-strength solution for creating film-quality animation using a vector and bitmap artwork. It eliminates the need to create animation frame-by frame, allowing you to produce 2D animation of a higher quality with fewer people and resources.

Features:
<ul><li>Can manipulate vector and bitmap artwork</li><li>Automatic tweening (independent from FPS)</li><li>Multitude of layers of various types (geometry primitives, shapes, gradients, fratals)</li><li>Full-featured bone system</li><li>Filters and effects for compositing (blurs, distortions, color manipulation, masks)</li><li>All color operations use High Dynamic-Range Imaging (HDRI)</li><li>Pentablet-friendly tools</li><li>Sound support</li><li>Linking data on file or parameter-level</li><li>Automatic animation using mathematical functions</li></ul>