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:

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