Network Time was a little control panel that set the clock on your Apple® Macintosh® computer using the Network Time Protocol. For years now the ability to set the clock via the Internet has been built-in to the Macintosh operating system (via the Date & Time control panel/Preferences pane), so you probably shouldn't use Network Time anymore, even if you can find it. I certainly don't take money for it anymore, so please don't send it.
For more information on the Network Time Protocol, see the Network Time Protocol Project web page run by David L. Mills, the author of NTP. If you need a time server to use in Network Time or any other NTP application, please use one of the NTP Pool Time Servers.