Any implementation or reimplementation of Emacs.
"The school's computer lab is full of those older beige emacs that everyone jokes about being as slow as a snail."
plural of eMac
A particular visual or WYSIWYG text editor (first written by Richard Stallman in 1975 but since reimplemented by others in several distinct versions), distinguished by its use of control characters as editing commands, by its lack of distinct "insert" and "edit" modes, and by its featurefulness and extensibility.
"After years of relying on a simple graphical editor, the developer finally switched to Emacs because they loved how every command could be triggered with specific keyboard shortcuts without ever toggling between different editing states."