Unearthed Adventurers Volume I

From Introduction:

This book is the first volume in a series from Malladin’s Gate Press introducing a number of new core classes for use in your D20 game. They are completely new classes that have as much flexibility in their design as fighters and rogues. In fact you will probably find that they are more flexible than many of the basic classes presented in Core Rulebook I. Each character class comes with complete descriptions of the new systems that bring them to life and the new feats and spells frequently used by these characters.

This book introduces three new core character classes: the cultist, the divine knight and the swordsman.