Functional Programming Patterns in Scala and Clojure

The Healthy Programmer

Good Math

Explore It!

Outsource It!

iOS SDK Development

Practical Vim

Seven Databases in Seven Weeks

Programming Clojure

Build Awesome Command-line Applications in Ruby

The Developer's Code

The Cucumber Book

Lean from the Trenches

The RSpec Book: Behaviour Driven Development with RSpec, Cucumber, and Friends

Pragmatic Unit Testing in C# with NUnit