Appears in collection : Jean Morlet Chair - School -Renormalization and Visualization for packing, Billiard and Surfaces / Chaire Jean-Morlet - Ecole - Renormalisation et visualisation pour des problèmes d'empilement, de billard et de surfaces

In these lectures I will describe many of the experiments I have done with inner and outer billiards. These include: McBilliards: a program which investigates billiards in triangles (joint with Pat Hooper)Billiard King: a program I used to solve the Moser-Neumann problemSome variants of Billiard king, which treat other outer billiards sys-tems.Billiard King3D: A program I have been using lately to study billiards in orthoschemes (a kind of tetrahedron).A program I wrote to study symplectic billiards with Sergei Tabach-nikov . I will try to show in the talks how almost all the results I have got on this topic have come from playing with these interfaces. I am open to sharing the software and helping people set up their own programs.