fewbody
Small-N Gravitational Scattering Package
Fewbody is a small number N-body gravitational scattering package. It is described in some detail in Fregeau, et al. (2004) (http://arxiv.org/abs/astro-ph/0401004). There is also a user's guide in the "doc" directory of the latest version (0.26 at the time of writing).