Re:Modern, functional Common Lisp: myths and best practices
by TurboHaskal on Tuesday February 25, 2020 @08:37AM
(#22413038)
Ideology aside, most proprietary compilers (mostly for Forth, Pascal and Lisp) I have used are of _excellent_ quality.
A lot also provide you the source code once you pay. AllegroCL is one of them I think.
That said, I support free software and I believe a proprietary compiler is not a good idea :(