Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
CKEditor - Real-time collaborative future-ready rich text editor
MJML - The open source framework for responsive emails
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.