ace-builds is a powerful code editor library that provides a versatile and feature-rich environment for editing code within web applications. It supports a wide range of programming languages and comes with features such as syntax highlighting, code folding, and autocompletion. Ace is highly customizable, making it suitable for various use cases, from simple text editing to complex integrated development environments (IDEs). While ace-builds is a robust choice for embedding code editors, there are several alternatives available that cater to different needs and preferences.

• ckeditor5 is a modern rich text editor that offers a wide range of features for content creation and editing. Unlike ace-builds, which focuses primarily on code editing, CKEditor 5 is designed for rich text editing and provides advanced functionalities such as collaborative editing, media embedding, and extensive plugin support. If your application requires a rich text editing experience with a focus on content creation, CKEditor 5 is an excellent choice.
• codemirror is another popular code editor library that provides a flexible and customizable editing experience. It supports a wide variety of programming languages and offers features like syntax highlighting, linting, and customizable themes. CodeMirror is lightweight and can be easily integrated into web applications. If you need a code editor that is easy to set up and customize, CodeMirror is a solid alternative to ace-builds.
• draft-js is a framework for building rich text editors in React applications. Developed by Facebook, Draft.js allows developers to create complex text editing experiences with features like undo/redo, custom block rendering, and inline styles. While it is not specifically a code editor, it can be adapted for various text editing needs. If you're building a React application and need a customizable rich text editor, Draft.js is worth considering.
• monaco-editor is the code editor that powers Visual Studio Code. It provides a rich editing experience with features like IntelliSense, syntax highlighting, and debugging capabilities. Monaco Editor is highly performant and is suitable for applications that require a full-fledged code editing experience. If you want a feature-rich code editor similar to ace-builds but with additional capabilities, Monaco Editor is an excellent option.
• prismjs is a lightweight syntax highlighter that can be used to highlight code snippets in web applications. While it does not provide a full code editing experience like ace-builds, it is an excellent choice for displaying code with syntax highlighting. If your primary need is to showcase code snippets rather than provide an interactive editing environment, Prism.js is a great alternative.
• quill is a modern rich text editor that focuses on providing a clean and customizable editing experience. It offers a wide range of features, including formatting options, themes, and a modular architecture. Quill is ideal for applications that require a rich text editing experience without the complexity of a full-fledged code editor. If you need a straightforward rich text editor, Quill is a good choice.
• tinymce is another popular rich text editor that offers extensive features for content creation. It provides a user-friendly interface and supports a wide range of plugins for additional functionality. TinyMCE is suitable for applications that require a robust rich text editing experience. If you are looking for a mature and feature-rich text editor, TinyMCE is a solid alternative.

To see how ace-builds compares with these alternatives, check out the comparison: Comparing ace-builds vs ckeditor5 vs codemirror vs draft-js vs monaco-editor vs prismjs vs quill vs tinymce.