PAC Manager is a graphical SSH client for Linux that attempts to streamline the process of using and configurating your SSH accounts and credentials. Written in GTK2 and Perl, the interface is packed full of features and customizations, with a particular focus on clusters of connections, allowing you to run processes in parallel on remote hosts just by using multiple simultaneous connections.
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Pros
Pro PAC is pretty simple and does its job of collecting and managing a list of connections that can be quicly used to connect to some machine through SSH
Cons
Con The developer officially abandoned the project
Early in 2017 the developer announced that he had no interest in continuing to develop it. Not a single line of code has been added or improved since then,
Con Heavily dependent on long-forgotten libraries
PAC Manager draws its underlying terminal functions from the Perl libraries written to interface with GNOME Terminal, circa...2006. The libraries have been untouched for at least five or six years, and just recently have begun to be removed from major distribution repositories like Debian and Ubuntu. It's a chore to get them installed and will only continue to get harder.