From the project home page:
The VMR CRE is an ecosystem of components. Many teams have contributed to this ecosystem [...]. The VMR CRE was developed under the supervision of Hugh Houghton and David Parker toward the PhD thesis, Software for the Collaborative Editing of the Greek New Testament by Troy A. Griffitts.
The VMR CRE is software framework aiming at creating a virtual research environment for all stages of the creation of a digital critical edition. It allows for collaboration among scholars and can be installed on different platforms, including Mac, Linux, and Windows.
Projects using the VMR CRE include:
The complete list with links may be found on the project home page.