From Roger Corman:
PowerLisp 2.02 is now available. It includes CLOS support (conforming to the Metaobject Protocol documented in "The Art of the Metaobject Protocol"). PowerLisp is a Common Lisp development environment for the Macintosh. It consists of a Common Lisp interpreter, native-code PowerPC compiler, PowerPC macro assembler, disassembler, incremental linker and multi-window text editor. It requires a PowerMac (the older version 2.01 supports 68k Macs).
PowerLisp has the ability to run in the background. While executing a Common Lisp program, the user may switch to another application as it continues to run.
PowerLisp is extremely fast. All compiled PowerLisp functions execute as native machine instructions. The speed is comparable to other fully compiled languages.