Administrating Solr
Surendra Mohan
Hack and HHVM: Programming Productivity Without Breaking Things
Owen Yamauchi
Understanding Bitcoin: Cryptography, Engineering and Economics
Pedro Franco
R in 24 Hours, Sams Teach Yourself
Andy Nicholls & Richard Pugh & Aimee Gott
Time Management for System Administrators
Thomas A. Limoncelli
Intellectual Property and Open Source
van Lindberg
Hackers :: Heroes of the Computer Revolution. (Reloaded)
Steven Levy