CMU Common Lisp
| CMUCL | |
|---|---|
| Original author(s) | Carnegie Mellon University | 
| Developer(s) | Various | 
| Initial release | Early 1980 | 
| Stable release | 21e
   /    May 14, 2023 | 
| Repository | |
| Operating system | Several POSIX-compliant OSs | 
| Platform | Cross-platform | 
| Available in | Common Lisp | 
| Type | Compiler and runtime | 
| License | Public domain | 
| Website | cmucl | 
CMUCL is a free Common Lisp implementation, originally developed at Carnegie Mellon University.
CMUCL runs on most Unix-like platforms, including Linux and BSD; there is an experimental Windows port as well. Steel Bank Common Lisp is derived from CMUCL. The Scieneer Common Lisp was a commercial derivative from CMUCL.