WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.

CKEditor - Real-time collaborative future-ready rich text editor

ApostropheCMS - Apostrophe is a powerful website builder platform built on an enterprise open source CMS, offering in-context live editing, visual design tools, and multisite enablement in a full stack JS environment.

Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.

Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.

Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.