1. [Data Science Tutorials](https://www.topcoder.com/community/data-science/data-science-tutorials/) 2. [visualgo.net](https://visualgo.net/) 3. [Data Structure Visualizations](http://www.cs.usfca.edu/~galles/visualization/Algorithms.html) 4. [algo-visualizer](http://algo-visualizer.jasonpark.me/)
