This includes the Babcom fan magazine, and the later Great Machine fan magazine, two of the highest quality supplements for a game that I've ever seen replete with content from people that later became game developers.
Also two more sets of ships for the Babylon 5 setting. One folder, B5 Source, includes fan created ships for those races that weren't detailed by AOG. The other, B5 Player, are ships created as additional races by fans to be included in the greater B5 universe. Most of these have significant background information included in the two fanzines.