ExMod

From SEWiki

A mod for SE4 by Frenchmen.

How it came to be:

What started as a weekend SEIV game with a friend that turned into the two of us changing a few little details in the data files has evolved into ExMod! After I changed enough stuff, I decided to make it publicly available, so, here it is.

A little about the mod:

ExMod adds many things, among them are;

Many rune techs including Death Stars, Alien Construction Ships, Improved Designs, and more!
Hulls : You can now add one(1) hull to a ship, different hulls have different bonus's (eg. Blue trillion adds lots of damage resistance and +1 bonus to ship speed)
NeoStandard ship sizes utilized
Research facilities generate less research
Remote mining doesn't make asteroids degenerate minerals
Remote mining is much more important to an empires economy
The amount of population on a planet is MUCH more important to production
New components added that you get from combination researches (eg. research energy stream and energy pulse and get a new weapon)
fighters improved in late game
More planets
Adds icons for your shortcuts

There's also a lot more, but you'll have to try the mod out to find 'em!