Awesome online talks and screencasts

Python Koans - Learn Python through TDD

Starting code for the GildedRose Refactoring Kata in many programming languages.

This is a Refactoring Kata based on the rules of Tennis

JUnit 5 Extension Pack

A hands-on, test driven guide to implementing a simple programming language

Legacy Code Retreat - Trivia Game codebase

Kata for a legacy code hands-on session. The objective is to write tests and refactor the given legacy code.

Sharpen is an Eclipse plugin created by db4o that allows you to convert your Java project into c#

hadoop-common-2.2.0/bin

A book starter to kickstart your writing journey 🎉

Several code katas on a racing car theme

Conway's Game of Life in 9 lines of C

TDD with Mock Objects: Design Principles and Emergent Properties (C#, JavaScript, Java, Python, Ruby)

Basics of the go language

Flowchart for choosing the right Clojure type definition form

Example from first chapter of 'Refactoring' by Martin Fowler, with tests and translations

A printable cheat sheet for the Eclipse SDK

C Koans

Kata to learn about Polymorphism

This is a refactoring kata for improving your coding skills

A Kata exercise. This one involves writing code to reserve seats on a train.

Starting code for a Refactoring Code Kata on the Yatzy rules

A refactoring kata where you'll practice disentangling business logic from frameworks and SQL

Runs tests against anything, using command-line arguments, STDIN, STDOUT and STDERR.

Regular Expressions tutorial in the style of Ruby Koans, written with Javascript and Jest

A timer for the "baby steps" exercise/technique for doing TDD

Command line tool for locking the focus of a Microsoft® LifeCam HD-5000 webcam

A curated collection of .windsurfrules files designed to guide AI coding assistants (like Codeium's Cascade) in generating code that adheres to various best practices, architectural patterns, langu…

Some sample data you could use to help test your solution to the Phone Numbers code kata, and a script to create it.