Sins of a Solar Empire is an award-winning RTS space battle game, and Mass Effect is an epic action RPG universe with enough lore to fill a library. What happens when you smash the two together in the particle accelerator chamber that is a fan-created mod? You get Mass Effect: Dawn of the Reapers, a full conversion for Sins that lets you command ships like the Normandy against various Mass Effect-inspired units, including those of the Geth, Volus, and Cerberus' ships as well.
There's lots more planned for the mod, including even more races and ships designed straight from Bioware's epic series. Unfortunately, the mod itself isn't available to the public just yet, and the release of Mass Effect 3 pushed it back for some more lore and spec tweaks. Still, when it's available it will work with both Sins' Diplomacy expansion and the standalone Rebellion version as well.