Algovision

http://kam.mff.cuni.cz/~ludek/

Algovision seeks to become an online textbook on data structures and algorithms-related topics, centered around a collection AVs implemented as Java applets. Each applet has an extensive guide to go with it (these guides collectively make up the textbook). Versions are being produced in Czech and in English.

Algovision is written by Ludek Kucera of Charles University, Czech Republic.