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This site mostly focuses on documentation for the developers of the framework, the documentation aimed at users is maintained in the main repository in Asciidoc format (https://github.com/eclipse-viatra/org.eclipse.viatra/tree/master/documentation/org.eclipse.viatra.documentation.help/src/main/asciidoc) and regularly pushed to https://eclipse.dev/viatra/documentation/
For further details about the history of VIATRA, see the paper Road to a reactive and incremental model transformation platform: three generations of the VIATRA framework in the Journal of Software and System Modeling.