This is, I believe, a seriously under-used command by engineers and Terminal ninjas. Whether you want a Finder window, Sublime, TextMate, SourceTree or any flavor of app that works on files or directories, `open -a [App Name] ./` smooths out a workflow that would otherwise involve Spotlight Search -> File -> Open -> Navigation -> Click. Gets even faster with `alias oa='open -a'` in your ~/.bash_profile.