SPHGR is a multi-purpose data reduction suite designed to read and then process GADGET, TIPSY, or HDF5 binary outputs from GADGET. Then general idea is to be a one-stop-shop to simulation analysis and data access. The resulting data is saved to the disk in distinct object files which allows for easy examination/plotting. See the documentation here: http://sphgr.readthedocs.io/en/latest/

[NB! SPHGR has migrated twice, first to the yt project (https://bitbucket.org/rthompson/sphgr_yt), and more recently as an improved version of the latter called Caesar (https://bitbucket.org/rthompson/caesar).]