Synfig is a powerful, industrial-strength,
vector-based 2D animation software package,
designed from the ground-up for producing
feature-film quality animation with fewer people
and resources.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release introduces a new interpolation method for animation, a fully-functional groups panel, a redesigned preview window, improvements for BLine editing routines, and some bugfixes.