Origins of World War I is a free print-and-play game by legendary wargames designer James Dunnigan. The game was re-implemented as Origins of World War II, an Avalon Hill game now long out of print. From the description:
A political/strategy game in which five players represent the five major nations in pre-World War I Europe. They must compete against each other to achieve each nation’s ‘national objectives’. While actual war is not allowed in the game, the play should show quite clearly how tensions developed to such a high pitch in 1914.