Blender 3d is a highly functional and versatile open source 3d graphics suite. Some amazing 3d art, cartoons, and productions have come out of it. But we would like to see just as amazing 2d animations 😉
Papayagayo is a lip syncing software. The user simply creates mouth images for each phoneme, tells papagayo where each phoneme should be displayed in conjuntion with an audio clip, then papagayo exports a file that programs like synfig can use to animate the mouth!