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 3,053 GitHub stars and is released under the MIT license. Its source code is on GitHub at lem-project/lem.
- Linux
- macOS
- Windows
- Code editors & developer tools
- Actively maintained
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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What is 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 3,053 GitHub stars and is released under the MIT license. Its source code is on GitHub at lem-project/lem.
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 7, 2026. appsgit only lists apps whose repository had a commit in the last six months.