Secure Shell

cryptographic network protocol for secure data communication, remote shell services or command execution and other secure network services between two networked computers

PuTTY () is a free and open-source terminal emulator, serial console and network file transfer application. It supports several network protocols, including SCP, SSH, Telnet, rlogin, and raw socket connection. It can also connect to a serial port. The name "PuTTY" has no official meaning.

OpenSSH (also known as OpenBSD Secure Shell) is a suite of secure networking utilities based on the Secure Shell (SSH) protocol, which provides a secure channel over an unsecured network in a client–server architecture.

network protocol that provides file access, file transfer, and file management functionalities over any reliable data stream, designed as an extension of SSH 2.0

alternative SSH-server and client

ConnectBot is an open-source Secure Shell client for the Android operating system. It lets users securely log in remotely to servers that run a secure shell daemon. This allows the user to enter commands from their Android device and have the commands run on the remote server instead of the local android device. It uses the standard encryption used by SSH2 to keep any commands and data that are transmitted from being eavesdropped by any potential listeners across the network.

ssh-keygen is a standard component of the Secure Shell (SSH) protocol suite found on Unix, Unix-like and Microsoft Windows computer systems used to establish secure shell sessions between remote computers over insecure networks, through the use of various cryptographic techniques. The ssh-keygen utility is used to generate, manage, and convert authentication keys.