GNU Emacs
Lisp-extensible editor that becomes almost an operating system.
Text editor programmable in Emacs Lisp, with a huge package ecosystem (Org mode, Magit, LSP) and over four decades of history.
When to use
When you want a fully programmable environment and accept a long learning curve.
When to avoid
If you want immediate productivity without configuration or unusual keybindings.
Alternatives
They do a similar job. Compare before choosing.
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