There are at least ten Free Software Common Lisp implementations and three proprietary ones that are still supported. There are four APL implementations, two of which are Free Software. As for Ada, I've read there are six Ada 2012 compilers, with GNAT being the only Free Software option; there are more, however, if you look to older Ada standards. It's interesting how these ostensibly more complex languages have compiler parity with C and C++ or exceed those, isn't it? I think the reason is that it's much harder to optimize C than it is more abstract languages, clearly, and C++ is simply so complex I've seen an entire company dedicated to just writing a parser for it.

As an aside, I find it interesting how many negative Internet points I'm receiving relative to the amount of responses there are. My figuring is many of these people can't argue with what I'm writing.