Lem
Lem is a free, open-source developer tool for Windows, macOS and Linux. General-purpose editor/IDE with high expansibility in Common Lisp. It has 3,067 GitHub stars and is released under the MIT license. Its source code is on GitHub at lem-project/lem.
github.com/lem-project/lem (opens in a new tab)
Data as of from the GitHub API; description from the project's repository. Report an error
About Lem
After installing lem, you can start developing and extend the editor while it runs. Tested on Ubuntu 24.04 and macOS(apple silicon).
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Is Lem free and open source?
Yes. Lem's source code is public on GitHub under the MIT license, which is OSI-approved or FSF-free, so you can use, copy and change it for free.
How do I install Lem?
Download the installer for Windows, macOS and Linux from its GitHub Releases page (latest: v2.3.0).
Is Lem still maintained?
The repository's most recent commit was on Oct 28, 2026. appsgit only lists apps whose repository had a commit in the last six months.