The main IDE for Lisp is emacs. If you don't want that, my suggestion would be to use Kate + copy-pasting code to the terminal or a Qt editor called CLedit
. It's very unknown, and has a lot of missing features (For example, there is only a Save As function, no Save function that can be triggered with Crtl+S the way I usually do). I've found Kate to be the best non-emacs Common Lisp editor. It essentially has everything the other editors (LispIDE, CLedit, gedit) lack: Supports both ;; and |# comments, code folding, the only thing that is lacking is proper parenthesis matching, but that can be changed in the Settings tab. It's hard to see it, though, until you change the highlighting color.