Apps: interactive tools

An interactive dynamic circular drawing tool: edit a circular (outerplanar) graph by hand, minimize crossings, and watch dynamic mode incrementally repair the embedding as you add edges.

A graph drawing editor with force-directed layout, upload your own graphs into (GraphML or JSON), and analyze with real graph drawing quality metrics from gdMetriX.

Learn and practice John Horton Conway's mental-math trick for computing the weekday of any date.