Dell XPS, 200MHz MMX, 64MB RAM, 4GB hard disk
Matrox Millenium (version 1), 4MB graphics card (no HW accel)
Three-button mouse (very handy)
OpenInventor v2.4.1: http://www.tgs.com/
Mesa 2.3: http://www.ssec.wisc.edu/~brianp/Mesa.html
(v2.6 and up are much faster)
InfoMagic Linux Developer's Resource Jan '98: Slackware Linux, v3.4:
http://www.infomagic.com/
InfoMagic Linux Developer's Resource Aug '97: Metro-X Server from Metro Link (curiously, this version is much quicker than the current version on my hardware)
MooTiff v2.0.1: Motif from InfoMagic