CotEditor is a lightweight, free plain-text editor designed specifically for Mac users. It supports a variety of programming languages and is ideal for web page development, source code editing, and general text manipulation. The application features syntax highlighting, line numbering, and customizable themes, making it suitable for both novice and experienced developers. Users can easily manage multiple documents with a tabbed interface, enhancing workflow efficiency.

In addition to its core editing capabilities, CotEditor offers powerful search and replace functions, enabling users to quickly find and modify text across documents. The editor also supports regular expressions for advanced search options and provides various encoding formats to ensure compatibility with different file types. Overall, CotEditor combines simplicity with functionality, making it a valuable tool for anyone working with plain text on a Mac.