Matrix Games (various)
This is a free-form role-playing/game system. It has scenarios for every time period and can recreate history or be used to get into characters. Ideal as the only additional equipment necessary is a single six-sided die. Games are not repetitive—even with same players. Highly recommended for use once you understand how they work/have experience with them (and still good otherwise). Hamster Press is good answering questions and with support material.