#ide #lisp #commonlisp #emacs #slime
SLY is Sylvester the Cat's Common Lisp IDE for Emacs.

From their github repository page:
"SLY is a fork of SLIME and contains the following improvements upon it:
Completely redesigned REPL based on Emacs's own full-featured comint.el;
Live code annotations via a new sly-stickers contrib;
Consistent interactive button interface. Everything can be copied to the REPL;
Modern flex-style completion. Much snappier when using company, and no plugin required;
Cleanly ASDF-loaded by default, including contribs, which are enabled out-of-the-box;
Multiple inspectors;
Support for NAMED-READTABLES, macrostep.el and quicklisp
SLY tracks SLIME's bugfixes. All its familar features (debugger, inspector, xref, etc...) are still available, with improved overall UX."
You can check it at:
Have fun!