NetTerm is described as 'network terminal which can act as a telnet client, direct connect terminal and modem connected terminal to hosts that support the telnet protocol or dial-in modems' and is a Terminal Emulator in the OS & Utilities category. There are three alternatives to NetTerm for a variety of platforms, including Windows, BSD, Linux, Mac and PortableApps.com. The best alternative is PuTTY, which is both free and Open Source. Other great apps like NetTerm are ZOC (Paid) and Tectia SSH Client (Paid).
PuTTY is a free and open-source terminal emulator, serial console and network file transfer application. It supports several network protocols, including SCP, SSH, Telnet, rlogin, and raw socket connection. It can also connect to a serial port.
Enterprises and government organizations around the world use Tectia SSH Client/Server to secure their most critical IT processes including ad hoc and automated file transfers as well as remote systems administration.