Code Kata: Sammlung von Dave Thomas
String Calculator von Roy Osherove
Coding Dojo Wiki
Ruby Quiz
Awesome Code Katas
katas.softwarecraftsmanship.org
TDD-Problems auf google sites
exercism.io
codebar.io
CDD School
Daily Programmer at Reddit
Learning Programming Languages with Koans: Ruby, JavaScript, Clojure
Python Koans
Ruby Koans
Haskell Koans
Functional Koans, in OCaml
Scala Koans von rubbish
Scala Koans von Dianne Marsh und anderen
Javascript Koans, by David Laing
Javascript Koans, by Liam McLennan
Javascript Functional Programming Koans
Funktional mit F# (VS Solution)
F# Snippets
C#