I remember that! I had Unreal Tournament 2004 and it technically had a native Linux version but it wasn’t on the CD. You had to extract most of the files from the CD and go download the Linux executable file from the unreal website to drop into the installation folder.
Quake III Arena also had a native Linux version.
And Quake, Quake 2, Descent, UT, Tribes 2.
I remember that! I had Unreal Tournament 2004 and it technically had a native Linux version but it wasn’t on the CD. You had to extract most of the files from the CD and go download the Linux executable file from the unreal website to drop into the installation folder.