A Common Lisp implementation in development, supports ASDF
Implementation of the standard is still not complete, but breakpoints and stepping work quite well! It also has some support for watchpoints, that no implementation has. Now it ships with ASDF and is capable of loading systems! Let me know if you like it. Support on Patreon or Liberapay is much appreciated
A Common Lisp implementation in development, supports ASDF launched on April 27, 2025 with 96 votes, #504 of 7,818 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
This is a Common Lisp implementation still under development with incomplete standard support. It features strong debugging capabilities including breakpoints, stepping, and watchpoint support that other implementations lack. The implementation ships with ASDF and can load systems. It targets Lisp developers seeking an alternative implementation with advanced debugging tools.
written from the facts on this page · September 2026
From the sources
Savannah is a central point for development, distribution and maintenance of free software, both GNU and non-GNU.
This is a lisp implementation. Now it is just an interpreter, but I will add some compilation later. I aim for Common Lisp conformance, but I'm not religious about it. To clone the repository, run this command: git clone https://git.savan ... org/git/alisp.git You can find the released tarballs down on this page, but I recommend running from the latest commit, since new features and bugfixes happen often. To get the gist of this project, see README ( https://git.savan ... p.git/tree/README ) and NOTES ( https://git.savan ... sp.git/tree/NOTES ). I write alisp in C89 syntax and standard library. I use GNU readline (optionally) and GNU mp as external libraries, for line input and arbitrary…from savannah.nongnu.org
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