mRemoteNG - mRemoteNG is a fork of mRemote, an open source, tabbed, multi-protocol, remote connections manager.
Truck - A faster alternative to FTP
PuTTY - Popular free terminal application. Mostly used as an SSH client.
SecPanel - SecPanel is an Ssh GUI for Unix.
Royal TS - Royal TS provides easy and secure access to your remote systems
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more