If you manage remote machines you have for sure some way to connect to them, to connect to Unix machines I'm used to open a terminal with my favorite terminal emulator (Terminator in these days), and from there ssh to other servers, for Windows RDP protocol as client i use Remmina (perhaps i'll talk of it in a future article) and for FTP and SFTP i use Filezilla, but i've found recently another interesting software that could change my habitudes: PAC Manager, where PAC stand for Perl/Gtk approach to connections managing.