NGists is an addon for the Logitech G15 keyboard that displays information about TeamSpeak on the keyboard's LCD display. You can also control TeamSpeak, to a limited degree, by using NGists and the G15 keyboard.
NGists uses the .NET Framework version 2.0 (hence the N in NGists) so you must install that before installing NGists. You will also need version 1.04 or later of the Logitech G15 software, available here.