larswm predates ion by a few years, and that was inspired by Rob Pike's acme programming environment for Plan 9 ( http://acme.cat-v.org http://acme.cat-v.org ),

larswm predates ion by a few years, and that was inspired by Rob Pike's acme programming environment for Plan 9 ( http://acme.cat-v.org http://acme.cat-v.org ), which was preceded by Help, which in turn was influenced by Oberon.