CKEditor - Real-time collaborative future-ready rich text editor
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
Synfig Studio - Just another WordPress site
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.