Nmap Network Scanning - by Gordon "Fyodor" Lyon
Producing Open Source Software
How to Run a Successful Free Software Project
by Karl Fogel
Beatiful Code
Leading Programmers Explain How They Think
Edited by Andy Oram & Greg Wilson
TCP/IP Illustrated Volume 1
The prottocols
by W. Richard Stevens
TCP/IP Illustrated Volume 3
TCP for Transactions , HTTP, NNTP, and the Unix Domain Protocols
by W. Richard Stevens