R

Open Science, Open Source and R

Free software will save psychology from the Replication Crisis. "Study reveals that a lot of psychology research really is just 'psycho-babble'".—The Independent.

A Good Front End for R

R is the de facto statistical package in the Open Source world. It's also quickly becoming the default data-analysis tool in many scientific disciplines. R's core design includes a central processing engine that runs your code, with a very simple interface to the outside world. This basic interface means it's been easy to build graphical interfaces that wrap the core portion of R, so lots of options exist that you can use as a GUI.