ShowSim and FWsim sometimes get mixed up. ShowSim is a pyrotechnic software first released in 2004, and was one of the first software packages of its kind. It features 3D graphics and realistic effects. The software is primarily targetted at professional pyrotechnicians, however, there is also a “Backyard Edition” available for hobbyists.
FWsim is a fireworks simulation software first released in 2010. It started out as a fireworks game and gradually evolved into a pyrotechnic simulation solution that is used by professional fireworks companies in 32 countries. A free trial is available. If you’re shooting fireworks for fun, try the game edition. If you’re working for a fireworks company or as a semiprofessional pyrotechnician, download the professional edition.