White Box: Unearthed Trove

Publisher's blurb:

White Box: Unearthed Trove is a supplement for White Box and is compatible with any other Swords & Wizardry game. It adds:

Three new character classes: the Assassin, the Illusionist and the Ranger. Each of them is designed to be simple and in the same fashion as the original White Box classes.
New races: Gnomes and Half-Orcs and their multi-classes: Fighter-Thieves, Thief-Illusionists and Cleric-Assassins
Combat Tactics for characters not involved in melee, missiles or spell-casting
Optional rules: Psionics which streamline the 1970s rules and Trauma to calculate psychological grind and derangement

User summary:

Intended for use with White Box: Expanded Lore