Documentation is available at https://testing.grails.org/
Documentation SNAPSHOT is available at https://testing.grails.org/snapshot/guide/index.html
Grails 7.0 branch is 4.0.x
Grails 6.2 branch is 3.2.x
Grails 6.1 branch is 3.1.x
Grails 6 branch is 3.0.x
Grails 5 branch is 2.4.x which includes support for Groovy 3.
Grails 4.0.x branch is 2.1.x.
Grails 3.x branch is 1.1.x.
Please see release notes for more information.