I remember there was one for unix back in the 90's, I think called Condor, that could be used to migrate long running processes to other machines. (I think the

I remember there was one for unix back in the 90's, I think called Condor, that could be used to migrate long running processes to other machines. (I think the tricky part was restoring external connections like file handles.) And before that, there were TeX and emacs, which do a memory dump and restore to save time loading their initial state. One of those, I think emacs, would tweak a core dump file to be a valid executable again.