For anyone currently going through algorithms and data structures, this is really nice. I would also like to suggest VisuAlgo.[1]

[1]: http://visualgo.net

For the interested, simulation of distributed synchronous network: https://github.com/rkarthick/morpheus-client

Did this as my school project.

I love this website! When I was hacking on a key value database it was invaluable for learning about B+ trees and other data structures suitable for indexing.