Portacle, a portable and multiplatform development environment
See Portacle, the portable and multiplatform development environment for Common Lisp. It's the easiest way to get SBCL + Emacs + Slime + Quicklisp + Git.
SLIME, the Superior Lisp Interaction Mode for Emacs
If you're doing serious Common Lisp development you should have a look at the complementary SLIME, which gives you the ability to develop Lisp programs interactively.
Parinfer helps to keep both indentation and parens balanced. It is straightforward to begin with, and yet opens the road to advanced features (similar to paredit). It has modes for various editors, emacs' one are in melpa.
See also Lisp_editing for various plugins.
Live interaction of Parenscript with the browser
- lisp-lang.org (presentation, success stories, modern tutorials, wiki, recommended libraries)
- reddit/r/common_lisp (see its links)
- awesome-cl awesome common lisp list
See also lisp_editing for various plugins to edit lisp code.