I just came across information for a demo from E.P.I.C. Interactive Entertainment for a Linux port of Robin Hood:  The Legend of Sherwood.  I downloaded the demo and was pleasantly surprised to find that it works on my (now aged) system:

Soyo SY-7VCAE Motherboard
Intel Pentium III 933 MHz Processor
3dfx Voodoo5 5500 AGP
Creative Labs Sound Blaster Live! Platinum (old 4.1 version)
Mandrake Linux Version 9.0

Here is the link to the requirements and a download site for the demo:

http://www.epic-interactive.de/Website2004/englisch/Projektseiten/robin/robin.html