One of the most distinctive features of Common Lisp and Lisp in general, are its code-generation and code-manipulation capabilities.
Probably the best example is the LOOP macro – a Swiss Army knife of iteration that can do pretty much anything. The following snippet iterates a list of random numbers collecting some statistics of its contents and does that while being very concise and readable:
StumpWM is a tailing window manager that allows you to define system-wide key bindings that work and feel pretty much like Emacs ones. Combining that with DuckDuckGo’es !bang syntax makes you just a few clicks away from anything out there: