This is a collection of programs for gravitational simulation of the n-body problem (i.e., gravitational evolution of n point masses under given initial conditions), and the central (restricted) (n+N)-body problem. I made them in C++ with a TCL graphical interface, so they work under Unix and Linux. Here you have a precompiled RPM binary (RedHat Linux 9.0). Please contact me if you want the source codes.