There was a project to reimplement OpenVMS under the GPL, http://www.freevms.net/ http://www.freevms.net/ - I think the project has stagnated, though, the last

There was a project to reimplement OpenVMS under the GPL, http://www.freevms.net/ http://www.freevms.net/ - I think the project has stagnated, though, the last commit in their git tree seems to have happened about two years ago.