Of course to use this program you have to have some idea what you are doing. But if you do, if you have some acquaintance with Kleinian groups, their fundamental domains and their limit sets, this program is imply awsome. I clearly illustrates all kinds of phenomena that are almost impossible to understand without, like geometric limits of Kleinian groups.Wada has done a phenomenal job, and the mathematical community that this concerns can only be eternally grateful. John Hubbard, Cornell, University

As always, OPTi allows us to see amazing limit sets of Kleinian groups. Thank you so much for bringing OPTi up-to-date for new hardware/OS.