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"EARN programming by visualizing code execution Online Python Tutor is a free educational tool created by Philip Guo that helps students overcome a fundamental barrier to learning programming: understanding what happens as the computer executes each line of a program's source code. Using this tool, a teacher or student can write a Python program in the Web browser and visualize what the computer is doing step-by-step as it executes the program."

Online C++ tutorial site

"Scratch is a programming language that makes it easy to create interactive art, stories, simulations, and games - and share those creations online."