OpenSSH is a set of FREE computer programs providing encrypted communication sessions over a computer network using the ssh protocol. OpenSSH allows telnet, rlogin and FTP users to encrypt all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other attacks.

OpenSSH server and client version 5.1 has just been released and available for download.

Some notable features are:

• Introduce experimental SSH Fingerprint ASCII Visualisation to ssh(1) and ssh-keygen(1).
• sshd now support CIDR address/masklen matching.
• Added an extended test mode (-T) to sshd(8) to request that it write its effective configuration to stdout and exit.
• ssh(1) now prints the number of bytes transferred and the overall connection throughput for SSH protocol 2 sessions when in verbose mode.
• Added a MaxSessions option to sshd_config(5) to allow control of the number of multiplexed sessions supported over a single TCP connection.

See the complete list of features here

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