PuTTY - Popular free terminal application. Mostly used as an SSH client.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
JuiceSSH - The all in one terminal client for Android including SSH, Local Shell, Mosh and Telnet support.
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.