The Zebulon's guide is the only existing accessory for Star Frontiers, it includes new character races, equipement and rules.
CA1 Swords of the Undercity
SFAC3 Zebulon\'s Guide
X10 Red Arrow, Black Shield
DL10 Dragons of Dream
Troubleshooting in the STAR FRONTIERS game universe; Errata for Zebulon\'s Guide to Frontier Space.