I sent you a large commit via e-mail.
Improved overall balance, esp in the tech trees. Races are still unbalanced but not as much as previously.
Modified several races tech trees to improve AI behavior.
Further balanced ships across all races. In general early, mid and late game ships esp for the younger races are better balanced against comparable time line ships. More advanced ships will generally defeat less advanced ships for the same logistics points. Some ships age badly, some age well, a few have researchable upgrades.
Cleaned up many descriptions across the game.
Added additional names for all races.
Three months of on again off again tweaking, I don't remember every change but lots of testing and researched changes.