CCL - Clozure CL
Produces fast native code; compiles faster
than SBCL. Also has some MacOS-specific goodies.
People sometimes use both CCL and SBCL at the same time, to have faster compiling during development via CCL and then better runtime performance of the released version via SBCL.
I used to use CCL for hobby gamedev back when SBCL had some troubles on Windows (they're gone now); now I only use it on Raspberry Pi (AFAIK SBCL couldn't utilize multiple cores on ARMs last time I checked (which was a years ago)).
I used to use CCL for hobby gamedev back when SBCL had some troubles on Windows (they're gone now); now I only use it on Raspberry Pi (AFAIK SBCL couldn't utilize multiple cores on ARMs last time I checked (which was a years ago)).