UI Movement - The best UI design inspiration, daily
CKEditor - Real-time collaborative future-ready rich text editor
UI8 - Carefully crafted UI design assets
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
UI Garage - Specific mobile and web design patterns for your inspiration
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.