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Lem vs Aquamacs: catalog facts
Lem	Aquamacs
Free Free and open source.	Free Free to download.
macOS, Linux, Command line	macOS
Extensible in Common Lisp while running Emacs-like and Vim-like modes	Emacs editing with a Mac-oriented setup Supports LaTeX, HTML and many programming languages
Extending it requires learning Common Lisp GUI is in transition from SDL2 to a webview version	macOS only Current stable release is based on an older Emacs; the newer version is still alpha
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.