Algorithm Visualizer - Write down your algorithm to be visualized
VisualSitemaps - Autogenerate visual sitemaps in seconds.
State.of.dev - Visualizing the current state of development
CodeAnalogies - Visual explanations of web development topics
Grokking Algorithms - An illustrated guide for programmers & other curious people
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.