I've had a lot of issues with the nVidia drivers and the kernel headers, but it's finally working. Here is a screenshot I took some minutes ago of the Caelum demo under Linux :)
Next: Getting Java and JavaCC to run :/
Ember is a client framework for Worldforge. It's not meant to be a standalone game, instead its purpose is to provide a solid and extensible base from which to build game-specific clients. One of the goals of Ember is to allow for easy customization of the codebase. Currently it supports the game world of Mason. It's available for all modern Linux distributions, FreeBSD and MS Windows.You can read more at http://wiki.worldforge.org/wiki/Ember