CASA and Pipeline can be found via the CASA site:
https://casa.nrao.edu/casa_obtaining.shtml
AIPS:
http://www.aips.nrao.edu/index.shtml
Obit (data reduction):
http://www.cv.nrao.edu/~bcotton/Obit.html
GBO Data Analysis
https://greenbankobservatory.org/gbt-observers/data-analysis/