Apps similar to Monaco Editor include CodeMirror, which is free and open source. Other options are ACE Code Editor and CodeJar. In total there are three Code Editors like Monaco Editor for self-hosting and the web.
Versatile text editor implemented in JavaScript for the browser. It is specialized for editing code, and comes with a number of language modes and addons that implement more advanced editing functionality.
Embeddable JavaScript code editor with syntax highlighting for over 110 languages, customizable key bindings, multi-cursor support, theming, live syntax checking, large file handling, regex search, plugin extensibility, compatibility with modern browsers, and open-source licensing.
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