Developer bookshelf

C#/.NET
Thinking in C#
CLR via C# (Fourth Edition) - Jeffrey Richter

Code
The Clean Coder - Robert "Uncle Bob" Martin
Clean Code - Robert "Uncle Bob" Martin
Code Complete (Second Edition) - Steve McConnell
Growing Object-Oriented Software, Guided by Tests - Steve Freeman

Testing

The Art of Unit Testing with Examples in C# (Second Edition)

The Cucumber Book: Behaviour-Driven Development for Testers and Developers - Matt Wynne
Quality Code: Software Testing Principles, Practices, and Patterns
Javascript Testing Recipes - James Coglan

GIT

Interactive tutorial - Got 15 minutes and want to learn Git? - GitHub

Interactive tutorial - Learn Git Branching

Online Book - Pro Git book - Scott Chacon
Ifographic - Git Pretty - so you have a mess on your hands - Justin Hileman
Article​ - Most common git screwups/questions and solutions​

Article - Dealing with emergencies in GIT - Emma Jane Westby

HTML/CSS/Javascript
Book - Javascript Testing Recipes - James Coglan
Online Book: Javascript Design Patterns - Addy Osmani
Online Book: Single Page App Book - Mikito Takada
Online Book: Programming JavaScript Applications - Eric Elliott
Website: JSBooks - free javascript books resource
Article: CSS Architecture​