z/Scope is described as 'multi-protocol, multi-host terminal emulator that provides access to multiple terminal-based applications in a way that is familiar to every user, using a modern tabbed interface' and is a Terminal Emulator in the OS & Utilities category. There are more than 25 alternatives to z/Scope for a variety of platforms, including Windows, Linux, Mac, BSD and Online / Web-based. The best alternative is PuTTY, which is both free and Open Source. Other great apps like z/Scope are ConEmu (Free, Open Source), cmder (Free, Open Source), Tabby (Free, Open Source) and Hyper (Free, Open Source).
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.
Hyper™ is a beautiful and extensible, cross-platform terminal built on open web standards. It provides an elegant command-line experience that is consistent across all supported platforms which includes macOS, Windows and various Linux distributions like Fedora and Debian.
iTerm2 is a replacement for Terminal and the successor to iTerm. It works on Macs with macOS 10.10 or newer. iTerm2 brings the terminal into the modern age with features you never knew you always wanted.
GNOME Terminal is a terminal emulator for the GNOME desktop environment written by Havoc Pennington and others. Terminal emulators allow users to execute commands using a real UNIX shell while remaining on their graphical desktop.
Yakuake is a drop-down (Quake-style) terminal emulator based on KDE Konsole technology. Its design was inspired from consoles in computer games such as Quake which slide down from the top of the screen when a key is pressed, and slide back up when the key is pressed again.