telnet and SSH client
Download from PortableApps.com
PuTTY Portable can run from a cloud folder, external drive, or local folder without installing into Windows. It's even better with the PortableApps.com Platform for easy installs and automatic updates.
PuTTY is a lightweight telnet and SSH client for Windows, along with an xterm terminal emulator. It allows you to securely connect to your systems while on the go.