Emacs is the extensible, customizable, self-documenting real-time display editor. Emacs has special code editing modes, a scripting language (elisp), and comes with many packages for doing mail, news and more, all in your editor.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.