SPARTA is an acronym for Subhalo and PARticle Trajectory Analysis. SPARTA is an MPI-parallelized C framework for the dynamical analysis of particle-based astrophysical simulations. The code has recently been introduced (Diemer 2017 and Diemer et al. 2017) and is currently being used to determine the splashback radius of individual dark matter halos in simulations.
Further publications about SPARTA are to follow, and the code will be made publicly available in the near future. If you would like to use SPARTA or have any other questions, please contact me.