EU4-Power-Vacuum
A Meiou and Taxes submod that makes the AI actually compete with you.
What this does
This mod fixes the AI's reluctance to do almost anything in the game on their own, while also heavily improving the pacing of your gameplay.
For a short overview:
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Power vacuums won't stay around until you fill in the place. Expect the AI to challenge your interests by conquering or guaranteeing nations in weak alliance blocks.
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Rival nations (based on opinion) raiding each other is significantly more probable now. This means that the AI will actually declare war on you as well, even if you're slightly stronger. (Although they still won't attack huge alliance blocks that they can't beat)
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Rivals will now subsidize weaker nations that are opposed to you
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Armies with strong per-unit combat ability will now actually challenge armies that are larger in numbers (1.7 ratio to 0.9)
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The AI actually develops provinces now. For some reason the mod authors of M&T seem to have misunderstood the AI willingness factors, which led to AI never building anything.
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Starter buildings are much cheaper. This should greatly speed up early-game province development and result in more realistic population numbers towards the end of the game.
Installation
Download source code and copy in %userprofile%\Documents\Paradox Interactive\Europa Universalis IV\mod