"R is a free software environment for statistical computing and graphics."
"RStudio is an integrated development environment (IDE) for R."
R is freely available here. RStudio is freely available here. You must have R installed to use RStudio.

"State-of-the-art statistical analysis software for making new discoveries."
SAS University Edition is free to download from here. SAS Education Analytical Suite is available at discounted prices through the UCSF Library here.

"IBM SPSS platform offers advanced statistical analysis, a vast library of machine learning algorithms, text analysis, open source extensibility, integration with big data and seamless deployment into applications."
SPSS Statistics Standard is available at a discounted prices through the UCSF Library here.

"Stata is a complete, integrated statistical software package that provides everything you need for data analysis, data management, and graphics."
Stata has a discounted Student license here, and an Educational license for other academics here.