So here’s a Programming and Coding Glossary for Kids with explanations of programming terms and links for getting into coding.
Then here’s a neat collection, the Kata-logue that lists a number of code katas by how easy it is to apply TDD to them.
Then, with cute cats posing in the sidebar, there’s codekata.com with explanations on the objectives of every kata.
Then, here’s a site bursting with real world problems suited for learning and practicing TDD under TDD Problems.
Then, there’s the amazing Cyber Dojo site for practicing code katas in a browser without any setup or somesuch.
Then, we also have another online great site, the Coders Dojo for reading up on and trying out code katas.
Then, there’s this site, full of Architectural Katas that look so tempting I can barely wait to try some of them.
Then, there is the original collection of Code Katas from Dave ‘PragProg’ Thomas that advises on How to Become a Better Developer.
Then, there’s the veritable and extensive collection of Code Katas on softwarecraftsmanship.org with screencasts.
As to programming competition problems, the UVa Online Judge site contains hundreds of problems for practice.
The CodinGame is where you can practice writing games, get it reviewed and possibly even get yourselves hired.
A genuine treasure trove is the problem archive of ACM ICPC aka ACM International Collegiate Programming Contest.
Did we miss any? Do let us know!