I tend to use Common Lisp for some personal projects, or small one-offs for work to make something easier. Libraries are great, and easily managed via Quicklisp

I tend to use Common Lisp for some personal projects, or small one-offs for work to make something easier. Libraries are great, and easily managed via Quicklisp (with info in quickdocs, as well as Hyperspec). And SLIME in Emacs is amazing to use. I've seen some comments that say, "well, if you use CL, that's all you know." I'm not sure that it's a problem though, because the standard means that you can often use much of the same code on multiple implementations, operating systems and architectures. e.g., you're not stuck on the JVM, but can use it (with ABCL). You can probably use the same implementation, like CCL or SBCL, on Windows, Mac, Linux, on x86, ARM, and so on.