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Emacs
Emacs is the extensible, customizable, self-documenting real-time display editor. Very popular with Linux/UNIX users, emacs is also more than just an editor. Find emacs documentations, user manual, FAQ here.
Emacs 101
The pre-requisite of Emacs basics.
Emacs Documentation - Table of Content
A detailed manual for Emacs users.
Why Emacs is Popular
For many users Emacs is more than just an editor. Here is what Emacs fans say about the reasons for choosing emacs over other editors.