CodeWeavers CrossOver - Don't buy a Windows license, don't reboot and don't use a Virtual Machine. Try a free trial of CrossOver to run your Windows software on Mac, Linux and Chrome OS.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Cautoh - Turn your phone into a breathalyzer
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Truck - A faster alternative to FTP
JuiceSSH - The all in one terminal client for Android including SSH, Local Shell, Mosh and Telnet support.