Mumford and Ellul are among the references in Vaclav Smil's Energy in World History, which I'm just completing. It came out in 1994, too early for Kaczynski's Manifesto (1995), but it wouldn't surprise me if he references it in later works (I've not yet checked).

Bill Joy cites Kaczynski in his own Wired 2000 essay, "Why The Future Doesn't Need Us".