wysihtml
wysihtml is an extended and less strict approach on xing/wysihtml5 open source rich text editor. The code is library agnostic and has all dependencies bundled, no jQuery, Prototype or similar is required. The currently bundled dependencies are rangy.js (including textrange and selectionsaverestore modules) and base.js. This project is supported by Voog. It’s an open source, community developed wysiwyg html rich text editor. Any web developer can grab it and use it in her projects. Fast and lightweight, auto-linking of urls as-you-type, valid, semantic HTML5 (even when pasting from Word), no iframes required, no jQuery required, and it's modular, so you can add your own tools. Object namespace is now wysihtyml (was previously wysihtml5). This change includes all classnames and event names. The default toolbar is separated to independent module (wysihtml.toolbar.js) and must be added separately if used.
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ProseMirror
Rich content editors should, ideally, produce clean, semantically meaningful documents while still being easy for users to understand. ProseMirror tries to bridge the gap between editing explicit, unambiguous content like Markdown or XML, and classical WYSIWYG editors. It does this by implementing a WYSIWYG-style editing interface for documents more constrained and structured than plain HTML. You can customize the shape and structure of the documents your editor creates, and tailor them to your application's needs. ProseMirror has built-in, ground-up, rock solid support for collaborative editing, where multiple people work on the same document in real time. Document schemas allow editing documents with a custom structure without writing your own editor from scratch. A modular architecture makes sure you only load the code you need, and can replace parts of the system as needed. A plugin system allows you to easily enable additional functionality.
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Popline
Popline is a non-intrusive WYSIWYG editor. It shows up only after selecting a piece of text on the page. Inspired by popclip. It provides commonly used editing features out-of-the-box. Easy to extend, Easy to customize. Two modes supported, edit mode and view mode. Two popup ways supported, fixed and relative. Compatible with Chrome, Safari, Firefox, Opera 15.0+, IE 8+. The default theme popline used is designed by @Pepsin. Popline also support View Mode, you can send a twitter, a facebook message, pin an image to pinterest, search with google in View Mode. Popline can popup at top of the paragraph which you selected (like Medium) or popup on the mouse pointer position. You can enable/disable/reorder plugins when popline initializes.
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Squire
Squire is an HTML5 rich text editor, which provides powerful cross-browser normalisation, whilst being supremely lightweight and flexible. It is built for the present and the future, and as such does not support truly ancient browsers. It should work fine back to around Opera 10, Firefox 3.5, Safari 4, Chrome 9 and IE8. Unlike other HTML5 rich text editors, Squire was written as a component for writing documents (emails, essays, etc.), not doing wysiwyg websites. If you are looking for support for inserting form controls or flash components or the like, you'll need to look elsewhere. However for many purposes, Squire may be just what you need, providing the power without the bloat.
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