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.
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.