The Maelstrom Mod introduces three new races to the Sins of a Solar Empire Universe. They are independent of the original races and have unique strengths and weaknesses. Maelstrom is available Rebellion, Diplomacy, Entrenchment and Original Sins.
Good mod but, crashes to an unacceptable extent. -5 for just that, because a game is not worth playing if it's not stable.
The models are not that unique either, they're cut and pasted ships from SOASE original game.
What makes this mod different is the fame play styles that it encourages.