Software Engineering
- Best Kept Secrets of Peer Code Review by Jason Cohen, Steven Teleki and Eric Brown
- Software Performance and Scalability by Henry H. Liu
- Exploring Expect by Don Libes
- Designing Data-Intensive Applications by Martin Kleppmann
- Vagrant: Up and Running by Mitchell Hashimoto
- Ansible: Up and Running by Lorin Hochstein
- sed & awk by Dale Dougherty
- Release It! by Michael T. Nygard
- Mature Optimization Handbook by Carlos Bueno
- Practical Monitoring: Effective Strategies for the Real World by Mike Julian
- The Mythical Man-Month by Fred Brooks
Erlang/Elixir
Linux/UNIX
- How Linux Works by Brian Ward
- The UNIX Programming Environment by Brian Kernighan and Rob Pike
- The Design of the Unix Operating System by Maurice J. Bach
- DNS and BIND by Paul Albitz and Cricket Liu
Javascript
- Javascript: The Good Parts by Douglas Crockford
- Interactive Data Visualization for the Web by Scott Murray
Bash
- Advanced Bash Scripting Guide by Mendel Cooper
Ruby
- Practical Object-Oriented Design in Ruby by Sandi Metz
- Ruby Science by Joe Ferris and Harlow Ward
- Multitenancy with Rails by Ryan Bigg
- Testing with RSpec by Aaron Sumner
PHP
- PHP and MySQL Web Development (4th Edition) by Luke Welling and Laura Thomson
Python
- Dive Into Python by Mark Pilgrim
- Foundations of Python Network Programming (2nd Edition) by Brandon Rhodes and John Goerzen
- Practical Django Projects (2nd Edition) by James Bennet
Lua
- Programming in Lua by Roberto Ierusalimschy
C/C++
VimL
- The VimL Primer by Benjamin Klein
Databases
- Graph Databases by Ian Robinson, Jim Webber and Emil Eifrem
- Learning Cypher by Onofrio Panzarino
- Seven Databases in Seven Weeks by Eric Redmond and Jim R. Wilson
Data Science
Machine Learning
- The Hundred-Page Machine Learning Book by Andriy Burkov
3D Graphics
- Digital Lighting and Rendering (2nd Edition) by Jeremy Birn
- Introducing Character Animation with Blender by Tony Mullen
- Mastering Blender by Tony Mullen
Business
- The Secret of Selling Anything by Harry Brown
- The Lean Startup by Eric Ries
- Innovation and Entrepreneurship by Peter Drucker
- Getting to Yes by Roger Fisher, William L. Ury and Bruce Patton
- Platform by Michael Hyatt
- Linchpin: Are You Indispensable? by Seth Godin
Healthcare
- Principles of Health Interoperability, HL7, and SNOMED by Tim Benson
- Rockefeller Medicine Men: Medicine and Capitalism in America
Economics
- The Use of Knowledge in Society by Friedrich Hayek
Ham Radio
- The No-Nonsense Technician-Class License Study Guide by Dan Romanchik
Mathematics
- Mathematics for the Nonmathematician by Morris Kline
- Introductory Statistics by Barbara Illowsky and Susan Dean
- Think Stats (2nd Edition) by Allen B. Downey