vi and Vim Editors Pocket Reference
Arnold Robbins
SSH - The Secure Shell (2nd Edition)
Daniel J. Barrett & Richard E. Silverman & Robert G. Byrnes
Revolution in the Valley
Andy Hertzfeld
Programming Perl
Tom Christiansen & Brian D Foy & Larry Wall & Jon Orwant
JavaScript: The Good Parts
Douglas Crockford
Java in a Nutshell
David Flanagan & Benjamin J. Evans
Information Architecture: For the Web and Beyond
Louis Rosenfeld & Peter Morville & Jorge Arango
Head First Java
Kathy Sierra & Bert Bates
head first (3)
Hackers & Painters
Paul Graham
Git Pocket Guide
Richard E. Silverman
DNS and BIND, 5th Edition
Cricket Liu & Paul Albitz
Data Analysis with Open Source Tools
Philipp K. Janert
The Cathedral & the Bazaar
Eric S. Raymond
97 Things Every Programmer Should Know
Kevlin Henney