M-x ielm Run Emacs Lisp REPL
M-x shell Run bash shell
M-x slime Run Common Lisp REPL
-M-x smerge-mode Resolve merge conflicts
+M-x smerge-ediff Resolve merge conflicts in multi-window mode
+M-x smerge-mode Resolve merge conflicts by hunks
M-x restclient Open HTTP client
M-x yas-reload-all Reload all snippets