What about Duke 3D? Apparently the original source has been released so it runs natively on linux...http://icculus.org/duke3d/
I have a couple of compile planned this weekend, I will probably give Duke3d a try
Also I looked at Lincity, it use X or SVGAlib etc, thats would take a lots of coding to port to the SDL or something copatible with the zaurus. Probably too much work. (Well i think, i have not looked at the source code).
For scummvm, just take our package at zports.sf.net, the 0.6.0cvs is there.
I did a lots of lucasarts games, that emu is great for the zaurus.
And there is also the warcraft II clone (another thread). Im waiting on the guy answer to see if he want to add it on zports web page