Recently, version 0.80 of Sins of the Prophets was released. It’s a free mod (modification) for Sins of a Solar Empire: Rebellion which turns that game into a great strategy game based in the Halo universe. Basically, it’s the the closest you’ll get to a digital counterpart to Halo Fleet Battles.
The SotP guys are reaching out to the community for help with promoting the mod, and have set up a contest. If you, or someone you know has the game and has the skills to make a great looking trailer, then be sure to check out the contest rules and help the SotP community to bring the mod to more people. The contest ends on May 6.