JASP: JASP is an open-source statistics program that is free, friendly, and flexible. Armed with an easy-to-use GUI, JASP allows both classical and Bayesian analyses.
jamovi: jamovi is a new “3rd generation” statistical spreadsheet.
The R Commander: The R Commander is a graphical user interface (GUI) to the free, open-source R statistical software. The R Commander is implemented as an R package, the Rcmdr package, which is freely available on CRAN (the R package archive).
Un-categorized useful links
ThreeDWorld: A High-Fidelity, Multi-Modal Platform for Interactive Physical Simulation