Downloading IPGateway 1.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free Mac application was originally produced by Shengbin Meng.
From the developer:
IPGateway is a lightweight application that provides an easy way for logging in and logging out the IP gateway of Peking University on your Mac. The tool installs in the upper menu bar of your Mac, so that you can access it with ease whenever you need to log in or log out the Peking University's website.