Bash Pocket Reference
Arnold Robbins
Gitolite Essentials
Sitaram Chamarty
Java 8 in Action: Lambdas, Streams, and Functional-Style Programming
Raoul-Gabriel Urma & Mario Fusco & Alan Mycroft
The Amazon Way
John Rossman
NGINX High Performance
Rahul Sharma
Apache Solr Essentials
Andrea Gazzarini