HotSwitch is a window switcher app for OS X.
It provides fastest window switching, no matter how many windows there are.
Detailed information is here. http://oniatsu.github.io/HotSwitch/
Download and install HotSwitch.
This way requires Homebrew Cask. Execute the following command at your terminal.
$ brew cask install hotswitch
See HotSwitch page.
Welcome at any time.
Send Pull-Request when you fix some bugs or modify some functions.
HotSwitch is released under the MIT License.
See here.