whats a good free IDE for common lisp

[darkdiablo]

I am a freshmen computer science major. I know a lot of java already, looking to learn common lisp as my second language since I want to learn functional languages too, anyone know a free good IDE for common lisp?

 

[mundane]

I use SLIME: "The Superior Lisp Interaction Mode for Emacs". Most of my coworkers, however, use ELI