Slate is a customizable framework that lets you build rich, intuitive editors like in Medium, Dropbox Paper or Google Docs.
TOAST UI Editor provides Markdown mode and WYSIWYG mode. The TOAST UI Editor offers Markdown mode and WYSIWYG mode, those can be switched at any time during writing content.
Pell is the simplest and smallest WYSIWYG text editor for web, with no dependencies.
Quill is a modern rich text editor built for compatibility and extensibility. It's a free, open source WYSIWYG editor built for the modern web.
Trix is a WYSIWYG editor for writing messages, comments, articles, and lists—the simple documents most web apps are made of. It features a sophisticated document model, support for embedded attachments, and outputs terse and consistent HTML.
Jodit Editor is a beautiful and functional WYSIWYG HTML text editor with file browser out-of-box.
It's free for non-commercial use.
Kajero notebook is just a Markdown document with a script attached. Kajero is designed to make it really easy for anyone to create good-looking, responsive, interactive documents.
Carbon is an extendable and beautiful rich text editor in the browser. It is inspired by Medium Editor.
It is built on top of an internal model for an article that clients can translate to and from JSON and HTML.
Easy Editor is a lightweight and highly configurable rich text html editor. You can use fontawesome icons on buttons area and also can upload and insert image on editor.
Simditor is a browser-based WYSIWYG text editor. It's based on jQuery.
Bootstrap Markdown is a plugin for markdown editing. It exposes useful API that allow you to fully hook-in into the plugin.
wysiwyg.js is a lightweight content editable jQuery editor which works with legacy browsers.