OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
CKEditor - Real-time collaborative future-ready rich text editor
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.
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.