Essentials

Essentials expands automation and redstone in a balanced and vanilla style. While there's full ingame documentation with Patchouli installed (strongly recommended), here's a few highlights:

A single block chest that remembers item types for each slot
Farmland that self-replants
Simple and cheap item transport and sorting
Single-block redstone circuits that can do logic or math
And more...

Essentials has no worldgen, no balance destroying features, has ingame documentation, and is highly configurable. It can be dropped into a modpack without issues.