We are grateful for the multitude of free software upon which this website is reliant, including Linux, Python, WordPress, CodeMirror, Polylang, and FlexiGrid. Our sandbox is a customized version of SafeExec from Mooshak. Thanks to Philip Guo and Peter Wentworth for building the original visualizer and its Python 3 port. The fractal banner is by Frédéric De Jaeger.
The text and code for this site were written by David Pritchard and Graeme Kemkes, with admin-fu by Andy Kong. Thanks go to Brian Bi, Gordon Cormack, Tor Myklebust, and Douglas Stebila for their help getting started. Thanks to Cora, Lisa, Francis, J.P., and Troy for valuable feedback. We thank the main translator, Brice Canvel, for translating the site into French.
This project is run by the Centre for Education in Mathematics and Computing at the University of Waterloo, which has been funded in part by the Bill & Melinda Gates Foundation. We also thank GitHub for freely hosting our version control system, where some modules of our code are available.