Software on the Side: Books

This is my list of recommended reading. Most of these I have quoted or referenced in some post. It is by no means complete and therefore will change as I remember books and read new things. I have plenty of books on my "to read" list that I'm sure will make this list, but this is a good start.

Craftsmanship

Clean Code: A Handbook of Agile Software Craftsmanship by Robert Martin
The Clean Coder: A Code of Conduct for Professional Programmers by Robert Martin
The Pragmatic Programmer: From Journeyman to Master by Andy Hunt and Dave Thomas
Software Craftsmanship: Professionalism Pragmatism Pride by Sandro Mancuso
The Coding Dojo Handbook by Emily Bache

Learning

Quickstart Guide to the Five Rules of Accelerated Learning by Willem Larsen and Diana Larsen

Coding Practices

Test Driven Development: By Example by Kent Beck
Agile Principles, Patterns, and Practices in C# by Robert Martin and Micah Martin
Head First Design Patterns by Elisabeth and Eric Freeman with Bert Bates and Kathy Sierra
Working Effectively with Legacy Code by Michael Feathers

Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides (also known as the Gang of Four or GoF)
The Mythical Man-Month: Essays on Software Engineering by Fred Brooks

Teams

Agile Retrospectives, Second Edition: A Practical Guide for Catalyzing Team Learning and Improvement by Esther Derby, Diana Larsen, and David Horowitz

The Dream Team Nightmare by Portia Tung
The Retrospective Handbook by Patrick Kua
The Five Dysfunctions of a Team: A Leadership Fable by Patrick Lencioni
Liftoff: Launching Agile Projects & Teams by Diana Larsen and Ainsley Nies
Collaboration Games by Karen Greaves and Samantha Laing

Lean

The Goal: A Process of Ongoing Improvement by Eliyahu M. Goldratt and Jeff Cox
This is Lean: Resolving the Efficiency Paradox by Niklas Modig and Pär Åhlström
Commitment by Olav Maassen, Chris Matts and Chris Geary

Lean Software Development: An Agile Toolkit by Mary Poppendieck and Tom Poppendieck

Implementing Lean Software Development: From Concept to Cash by Mary Poppendieck and Tom Poppendieck

Communication

Agile Conversations: Transform Your Conversations, Transform Your Culture by Douglas Squirrel and Jeffrey Fredrick

Supercommunicators: How to Unlock the Secret Language of Connection by Charles Duhigg

Crucial Conversations Tools for Talking When Stakes Are High, Second Edition by Patterson, Grenny, McMillan, Switzler

Change

The Power of Habit: Why We Do What We Do in Life and Business by Charles Duhigg
Switch: How to Change Things When Change Is Hard by Chip Heath and Dan Heath
Fearless Change: Patterns for Introducing New Ideas by Mary Lynn Manns Ph.D. and Linda Rising Ph.D.

Continuous Delivery

The Phoenix Project: A Novel About IT, DevOps, and Helping Your Business Win by Gene Kim, Kevin Behr and George Spafford
Continuous Delivery: Reliable Software Releases through Build, Test, and Deployment Automation by Jez Humble and David Farley

C#

C# in Depth, Fourth Edition by Jon Skeet (the second edition is the last one that I really read, but having skimmed the fourth, my recommendation holds up)