SBCL 1.3.7 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions among the software users are 1.3, 1.1 and 1.0. The program belongs to Development Tools. The SBCL installer is commonly called sbcl.exe. We recommend checking the downloaded files with any free antivirus. This free tool was originally designed by SBCL.
From the developer:
Steel Bank Common Lisp (SBCL) is a high performance Common Lisp compiler. In addition to standard ANSI Common Lisp, it provides an interactive environment including an a debugger, a statistical profiler, a code coverage tool, and many other extensions.
You may want to check out more software, such as LispIDE, which might be related to SBCL.