> If there had been very good free versions of Common Lisp 20+ years ago, then I think the language would be more popular today. I guess it depends on what you

> If there had been very good free versions of Common Lisp 20+ years ago, then I think the language would be more popular today. I guess it depends on what you mean by "very good" and how big that "+" is, but weren't there at least two? For people with access to a Unix box (usually via universities, companies, or a shell account), CMUCL was available, typically on SPARC/Solaris, since the mid-80s sometime. And for people running home microcomputers, clisp was freeware on the Atari ST from the late '80s, and released as GPL in 1993, with ports to DOS, Amiga, and Linux.