Cool article, never knew the actual history of how Trenchbroom got started! Have been using it very casually over the last decade or so. There are some incredible Quake mappers out there making things that would make your jaw drop if you haven't seen Quake in quite a while.

For example, Arcane Dimensions[0] or the Quake Brutalist Jam[1]

[0] https://www.moddb.com/mods/arcane-dimensions

[1] https://www.youtube.com/watch?v=vquTPCYbOxk