The GPI Data Reduction team has just released version 1.0 of the the Gemini Planet Imager Data Pipeline, which allows transformation of raw data from GPI into calibrated spectral and polarimetric data cubes and provides a variety of routines for working with these data. For documentation and download information see:
http://docs.planetimager.org/pipeline/
Support is provided via the Gemini Data Reduction User Forum:
Happy post-processing!
GPI Data Reduction Pipeline v1.0 Released