clojure and clojurescript
https://github.com/clojure-emacs/clj-refactor.el (refactoring)
https://github.com/clojure-emacs/cider (IDE)
https://github.com/bhauman/lein-figwheel (code reloading)
emacs
https://github.com/magit/magit (the interface to Git)
https://github.com/abo-abo/avy (jumping around)
https://github.com/magnars/expand-region.el (marking stuff)
https://github.com/magnars/multiple-cursors.el (placing cursors at similar stuff and editing all at once)
clojure and clojurescript
https://github.com/clojure-emacs/clj-refactor.el (refactoring)
https://github.com/clojure-emacs/cider (IDE)
https://github.com/bhauman/lein-figwheel (code reloading)
emacs
https://github.com/magit/magit (the interface to Git)
https://github.com/abo-abo/avy (jumping around)
https://github.com/magnars/expand-region.el (marking stuff)
https://github.com/magnars/multiple-cursors.el (placing cursors at similar stuff and editing all at once)