Portacle is an emacs packaged to be easy for beginners, so no :)

You are doing yourself a huge disservice developing in lisp without slime. I've been using a vi-like for 25 years and vim for 20 years and still use emacs/slime for my lisp development environment.

>Can Portacle be used without Emacs? Does it integrate with Sublime Text, Atom or Vim?

For Lisp development, Emacs is superior.

There's also SLIMV for VIM, giving the same features.