This would become a commercial product later on... Opens a variety of formats... Has adjustable depth-cue & other features... Only 160 kb single EXE... Have included a smattering of models in case somebody did not have any handy...
https://archive.org/details/quick-3-d-1.1-beta-free-1998
https://archive.org/details/quick-3-d-1.1-beta-free-1998