Loxi - Easily add an events calendar to any website.
CKEditor - Real-time collaborative future-ready rich text editor
Whenever - Casual calendar app for iOS
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
Future - Calendar events around the clock
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.