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Some of the free software packages are from governments, for example [[Epi Info]], which is from [[Centers for Disease Control and Prevention|CDC]]<ref name=epiinfo>{{cite web|url=https://www.cdc.gov/epiinfo/index.htm|title=Epi Info|year=2008|publisher= CDC}}</ref> (Centers for Disease Control and Prevention). Some other software packages are from smaller or independent organizations or universities. Two other packages, [[R (programming language)|R]],<ref name=r>{{cite web|url= https://cran.r-project.org/|title= The R Project}}</ref> and [[PSPP]] are being developed as part of the [[GNU Project]] by a large group of individuals, many of them volunteers, all over the world. These packages are notable in that it is not just [[Open-source software|open source]] but also [[free software]] in the same sense that material written on Wikipedia is free: others can edit, use, and redistribute at will.
OpenStat and Instat were developed as teaching aids.<ref name=instat/><ref name=openstat>{{cite web|url= http://www.statpages.org/miller/openstat/|title= OpenStat|author= Bill Miller|year= 2009}}</ref> Other packages were developed for specific purposes but can be more generally used.
These free software packages have been used in a number of scholarly publications. For example, OpenStat was used in a research letter to JAMA<ref>
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