Google Docs is a word processor included as part of a free, web-based software office suite offered by Google within its Google Drive service. This service also includes Google Sheets and Google Slides, a spreadsheet and presentation program respectively.
R is a programming language and free software environment for statistical computing and graphics supported by the R Foundation for Statistical Computing. The R language is widely used among statisticians and data miners for developing statistical software and data analysis.
Mplus is a latent variable modeling program with a wide variety of analysis capabilities:
Mplus allows all these modeling features to be combined in a fully integrated general latent variable framework