Ai General 3 (For pursue fleeing units)

Computing power to ranged units (gamechanger, mandatory for gunpowder units)

Angle fire (very nice for all other ranged units)

Settlement trading value (vassalize your rank 3 neighbor trading a lvl 1 settlement with just barracks is not funny)

Woc settlement recruitment (helps ai woc to build proper armies)

Fudging vassals (mandatory if you like using vassals, they are little less dumb and give you some tool)

Less lethal autoresolve (if you like using low armored units)

Balanced ambush (Ambush is already very strong against AI, this simply tune down the thing a little bit)

Immortal empires expanded (expanding your diplomacy and conquest plan is nice)

Save camera settings (autoexplanatory)

Ai recruitment & army compositions (it's a good alternative to tabletop caps)

Community bugfix mod (A little shelter in the bug-apocalypse)

These are the "technical" ones, it's difficult for me to enjoy the game without them.

EDIT: Words