The Ge Reprocessing Tools (GeRT) allow users to carry out custom offline data reduction of Spitzer MIPS-Ge (70 um and 160 um) data. Most users will find that the Spitzer archive products are sufficient for their needs. The GeRT is contributed software from the Spitzer/MIPS Instrument Support Team made available to the public to help users maximize their science returns with MIPS-Ge data.