[Suicide Junkie]

The one "one-sided battles" issue mentioned as a reason for wanting the source, can be modded out. Proportions greatly reduces this, and it could be done to a greater degree. Just divide down the amount of the to-hit modifiers in all ways - sensors, ECM, training, armor, culture, and racial abilities. And perhaps, increase the structure and shield strengths compared to damage amounts, and perhaps reduce the turn length, if you want more battles that don't end in complete destruction.

Leaky shields and armor components will also help greatly in that regard.
Any ship which is hit will take at least some permanent damage, and with leaky armor, a ship can become crippled to uselessness long before it is actually destroyed.
Players who don't adjust their strategies in order to spread the damage around will be caught shooting at dead hulks while the enemies lay waste to their fleet.