Emacs

A family of cross-platform customizable text editors. It has many features, including syntax highlighting, automatic indentation, REPL support, debugging, code browsing, version control integration and much more. GNU Emacs and XEmacs are the two most popular versions.

First released1976
Developed byDavid A. Moon, Guy L. Steele Jr., Richard M. Stallman
Open-sourceYes

Interesting facts

Emacs is among the oldest free and open source projects still under development.

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