Synfig eliminates the task of manual tweening, producing smooth, fluid motion without the animator having to draw out each frame individually. This allows you to produce 2D animation with fewer people while producing art of a higher quality.
LibreOffice is the free power-packed Open Source personal productivity suite for Windows, Macintosh and Linux, that gives you six feature-rich applications for all your document production and data processing needs: Writer, Calc, Impress, Draw, Math and Base.
MyPaint is a fast and easy open-source graphics application for digital painters. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.
Take a look at the screenshots to see the program in action before downloading and trying it for yourself!
exists for several platforms
supports pressure sensitive graphics tablets
extensive brush creation and configuration options
unlimited canvas (you never have to resize)
basic layer support
MyPaint comes with a large brush collection including charcoal and ink to emulate real media, but the highly configurable brush engine allows you to experiment with your own brushes and with not-quite-natural painting. Before beginning it is a good idea to read the quick-start tutorial to see how the program is meant to be used. You can also visit the MyPaint Wiki.