Emacs is the preferred Lisp source code editor for most CL developers.

If you want to get going easily, get Portacle, a portable and multi-platform CL development environment. You get:

• Emacs, slightly customized,
• Slime,
• SBCL,
• Quicklisp,
• Git.

You only need to download Portacle and double-click to run it.

Page source: windows.md