Linux Games: Quake 3: Arena Demo is hereNov 21, 1999, 05:28 (7 Talkback[s])
"Just got the offical word from id Software that the Linux release of the Quake 3: Arena demo is here. Download either the (LG Local Mirror) tar.gz or the RPM."
id's Quake III Arena Demo page may be found here.
Linux Games, with some mirrors, is found here.