Cyg-hotkey is a UNIX-like drop down terminal through Cygwin in *Windows OS*.
You can simply download the latest .exe file and use it.
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Just like TotalTerminal(Visor) in Mac OS X or Tilda in Linux, cyg-hotkey can provide you a global hotkey enabled drop down UNIX-like termnial in Windows OS, thanks to the Cygwin project.
You can visit the main page of this project at Bitbucket. You are welcomed to submit issues.
If you are just using a Cygwin terminal with MinTTY, make and Mercurial installed(if not, you'd like to install them via Cygwin's setup.exe), you can type:
$ hg clone https://bitbucket.org/riverscn/cyg-hotkey
to get the latest version and read the README file for further instruction.