HackerRank is an online platform that provides a wide range of programming challenges and coding competitions, as well as a learning environment for developers and coding enthusiasts. It serves as a virtual hub where programmers can improve their coding skills, practice algorithms, and compete with others in a variety of programming domains.

The platform offers a vast collection of coding challenges across different programming languages and domains such as algorithms, data structures, artificial intelligence, databases, and more. These challenges are designed to test problem-solving abilities and coding proficiency.

"MILK" modules are classroom ready educational components which teach students and developers how to create accessible mobile applications, along with demonstrating the importance of creating these apps.

Each module contains:

1. Appropriate background about a specific accessibility issue
2. Steps to emulate that issue using a provided app
3. Information about how to make the app accessible to the target group
4. Steps to demonstrate that the accessibility issue has been repaired

These activities can be used at a wide range of venues including:

• Coding Camps
• Classrooms
• STEM Outreach Activities
• Workshops

This site has many simulations helpful in understanding various computer science topics taught in high school.

The index has a list of all the topics taught on this site.

Some favorites:

• The Sorting Balance (can be used instead of the weighing bags activity in ECS unit 2)
• Sorting Algorithms - bubble, insertion, merge
• Linear vs Binary Search

Erase All Kittens teaches children to code in a completely new way. Instead of just learning simple concepts, kids can learn professional languages by changing the code of the game, in order to build and fix levels as they play.

• Super fun gameplay and collectible kittens
• Real-world skills including HTML, CSS and JavaScript
• Builds up confidence, creativity and critical thinking

An online interactive resource for high school students learning about computer science.

CS Unplugged is a collection of free teaching material that teaches Computer Science through engaging games and puzzles that use cards, string, crayons and lots of running around.