R, RStudio and R Commander

R is a freely available language and environment for statistical computing and graphics which provides a wide variety of statistical and graphical techniques, such as linear and nonlinear modelling, statistical tests, time series analysis, classification and clustering.

RStudio is a popular, free, open-source Integrated Development Environment (IDE) that provides a user-friendly interface for the R programming language, making statistical computing and data analysis easier with features like a code editor, console, plotting tools, and environment management for data and variables. It helps organise code, visualise data, and manage projects.

R Commander (aka Rcmdr) is a free, open-source graphical user interface for the R statistical software, providing menu-driven options for data analysis and graphics, similar to SPSS, to help users, especially beginners, perform statistical tasks without writing complex R code, while also displaying the underlying code for learning purposes.