http://h34nug3iwqjf2376fmmzdhgqivckzemcujmarlptfqeqtq7vya47yyad.onion/2008/11/02/synfig-the-free-software-alternative-for-2d-animation/index.html
For a long time 2D animation software has been dominated by proprietary software. Other common multimedia tasks such as video playing, editing, raster and vector 2D graphics and 3D graphics or animation are currently being covered properly by free software / open source (FOSS) but there wasn’t enough FOSS alternatives for computer aided 2D animation.