Algorithm Visualizer - Write down your algorithm to be visualized
Algorithmia - Algorithmia makes applications smarter, by building a community around algorithm development, where state of the art algorithms are always live and accessible to anyone.
CodeAnalogies - Visual explanations of web development topics
Grokking Algorithms - An illustrated guide for programmers & other curious people
The Algorithm Design Manual - Learn about designing and analyzing algorithms
Pretty Funnels - Organise and optimise your digital funnels