...Currently it works with various CASSY(CASSY is a trademark by LD Didactic GmbH) interfaces and Go! Link(Go! Link is a trademark of Vernier GmbH) interface.
It's designed for school usage.
Binary packages are available from the openSUSE Linux Build-Service:
download.opensuse.org/repositories/home:/fschuett
Opsis is a Java applet designed to teach binary search tree algorithms. Opsis is not an animation program; rather, the system
uses visual programming in an abstract way.