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Re:Making of “Introduction to A*” by krat0sprakhar on Sunday October 12, 2014 @04:03PM (#8446420)
This came up on HN a couple of weeks back - http://www.algomation.com/

A few sorting algorithms - http://www.sorting-algorithms.com/

Visualization of Path-Finding Algorithms - http://qiao.github.io/PathFinding.js/visual/

Lastly, Mike Bostock (creator of D3) has a really cool bunch of algorithms over at his blog - http://bost.ocks.org/mike/

Re:Making of “Introduction to A*” by lebek on Sunday October 12, 2014 @04:39PM (#8446521)
I like Cortesi's take on algorithm visualization: http://corte.si/posts/code/visualisingsorting/index.html

My sense is that animated visualizations are good at giving an intuitive sense about performance, but static visualizations are better for understanding how an algorithm works. If I was implementing a sorting algorithm I'd rather have one of Cortesi's visualizations on hand.