There are many alternatives to Royal TSX for Mac if you are looking for a replacement. The best Mac alternative is OpenSSH, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Royal TSX and many of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Royal TSX are DWService (Free, Open Source), iTerm2 (Free, Open Source), NoMachine (Freemium) and Kitty terminal (Free, Open Source).
csshX is a tool to allow simultaneous control of multiple SSH sessions. It will attempt to create an SSH session to each remote host in separate Terminal.app windows. A master window will also be created. All keyboard input in the master will be sent to all the slave windows.