Electronics for Beginners
Jonathan Bartlett
The Hardware Hacking Handbook
Jasper van Woudenberg & Colin O'Flynn
A Complete Guide to Burp Suite
Sagar Rahalkar
Mastering Linux Administration
Alexandru Calcatinge & Julian Balog
Linux Advanced Routing and Traffic Control HOWTO
Gregory Maxwell & Remco Mook & Martijn Oosterhout & Paul Schroeder & Jasper Spaans & Bert Hubert