Netcat, nc command

Netcat - also known as nc is considered the Swiss army knife of system administrators. In its most basic usage, netcat acts as a simple utility which reads and writes data across network connections, using TCP or UDP transport protocols. But this simple tool finds diverse uses for system administrators (Unix & Linux alike). Hence the name Swiss army knife.
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Awesome timeline of Unix, Linux and Mac OSX

A beautifully constructed timeline of Unix which includes modern day Unix descendants such as Solaris and Mac OSX as well as Linux. This timeline is not very much unlike the mind map of Linux I had created a long time back. But this timeline also provides the year when the Unix/Linux flavor was born. [Via: Zwahlen Design blog]

Fig: Unix - Linux timeline