Event Horizon is a set of free wargames rules for quick play starship combat. It is played on a grid board.
starships
Star Wars Full Thrust Rules
Full Thrust is an excellent set of starship combat rules — my personal favorite, in fact. Here are a set of modifications and statistics for playing Star Wars battles.
Big Burn Fleet Actions
Big Burn is a set of free wargames rules for fleet actions in space.
Laplace, Newton & Lagrange Space Combat Game
Laplace, Newton & Lagrange is a is a
game of ship to ship combat in outer space. Using a unique movement system that forces players to deal with momentum, and a fast and simple combat system.
Tom’s Spaceship Games List
Here’s an amazing list of hundreds of spaceship games. Compiled by Tom Granvold, it includes board, miniatures, dice, card and role playing games. If you like such things, check out it out.