Possibly, but I’m not aware of them. I first heard the idea in the mid-90s, maybe it’s even older than that. The gist is that every version of every package is installed in a completely isolated directory, with its own entire “usr/local” hierarchy underneath. Then “creating an environment” means making a directory <envname> with an empty “usr/local” hierarchy, and linking in all the files from the relevant package version hierarchies there. Now “activating an environment” means “point your PATH at <envname>/bin”.
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