MobaXterm, mRemoteNG, Termux, PuTTY, Terminator, Windows Terminal, Tabby Terminal, Superputty, KiTTY, Gnome Connection Manager, Konsole, Alacritty, WezTerm, TinyShell, secpanel, MacTelnet, Pocketputty, SSH Cryptonaut, Token2Shell are some alternatives to FireSSH.