From publisher blurb:
The Book of Options is a supplement for the Swords & Wizardry Complete Rulebook. It offers 11 new character classes, two new ancestries (Gnomes and Stygians), new spells, new magic items, a revised copy of the Quick Primer for Old School Gaming, encounter tables that include the monsters from Fiends and Foes, and much more!
New character classes include:
The Barbarian, a non-rage-based fighter with wilderness skills and keen senses
The Bard, loosely based on the Celtic bard
The Chivalric knight, basically a cavalier for those familiar with older versions of D&D
The Demon Hunter, a spell-caster with unusual abilities
The Dwarven Priest, a dwarven cleric-like class
The Elfblade, essentially a fighter/magic-user
The Illusionist, casting spells that affect the eye and mind
The Necromancer, casting spells of death and control
The Troubadour, an illusionist-thief archetype
The Warlock, whose spells stem from non-divine powers
The Wrath-Chanter, a rage-based barbarian class
Everything in this book is optional, but it is a phenomenal resource for Referees and Players who want to expand the horizons of a Swords & Wizardry game!