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