Thanks for the post.
I always liked trueSpace. I first got it on a CD-ROM that came with the book "3D Madness" back in 1995. (book cost $1 at a clearance sale, CD-ROM also contained VistaPro, DOOM and lots of other fun stuff)
A couple years ago I was astonished to find out trueSpace was originally Caligari on the Amiga.