GroupClip - Shoot synchronized video clips together with your friends.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Elucidat - HTML5 e-learning authoring software for creating amazing and ambitious responsive online and mobile e-learning.
Synfig Studio - Just another WordPress site
audli.io - audli.io is an audio plus slides platform.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.