Short list of source code files and their contents: main.c: Main program execution path. rockstar.c: Master code for finding halos/subhalos. fof.c: Code for assembling FOF groups. groupies.c: Code for finding substructure within 3D FOF groups. subhalo_metric.c: Code for deciding particle-halo membership. potential.c: Code for calculating gravitational potentials. fun_times.c: Code for calculating likely progenitors of current halo seeds. merger.c: Code for calculating particle-based merger trees. halo.h: Halo structure definition particle.h: Particle structure definition universal_constants.h: Gravitational and conversion constants. jacobi.c: Code for calculating eigenvectors/eigenvalues of symmetric matrices. distance.c: Code for calculating cosmological distances. universe_time.c: Code for converting scale factors to times. nfw.c: Code for calculating the scale radius given a mass and vmax for an NFW halo. io/meta_io.c: Code for reading and writing particle and halo data. io/io_[ascii|art|gadget|generic|tipsy|internal].c: Code for reading particle formats. io/io_bgc2.c: Code for writing particles in the BGC2 format io/io_util.c: Code for reading FORTRAN formats and swapping endianness. io/read_config.c: Code for parsing configuration files. io/stringparse.c: Efficient scanf() replacement. server.c: Code for master task. (Parallel IO) client.c: Code for reading / analysis parallel tasks. (Parallel IO) load_balance.c: Code for dividing work fairly among analysis tasks. inet/socket.c: Code for interfacing with TCP sockets. config.c: Code for loading configuration. config.template.h: Code for config variables. fast3tree.c: Binary Space Partitioning tree code. litehash.c: Lightweight hash tables. check_syscalls.c: Error-checking for fopen(), realloc(), fread(), and fwrite().