The best alternatives to Tabby are Hyper, Microsoft Terminal, and TermBar. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hyper is an open-source and extensible terminal emulator available on MacOS, Windows, and Linux. It's built using web technologies, specifically Electron (the same platform that powers Atom, Slack, and Brave).
Windows Terminal is a terminal emulator for Windows 10 written by Microsoft. It includes support for the Command Prompt, PowerShell, WSL and SSH. After the initial source code release on GitHub, a preview release was first published to the Microsoft Store on June 21, 2019.
iTerm2 is a replacement for Terminal and the successor to iTerm. It works on Macs with macOS 10.14 or newer. iTerm2 brings the terminal into the modern age with features you never knew you always wanted.