This is just an index of the mods I use when playing Factorio, whether I play single player or coop MP. I avoid the huge mods, such as DyTech, Bob's Mods, F-Mod and so forth, that are pretty much meant to be used as one's only mod in that they massively change the gameplay experience; instead, I "design" my own Factorio experience by using a carefully selected collection of small- and medium-impact mods.
This post is a work-in-progress; I'll add to it, enhance it in various ways, over the coming weeks (if not months). And of course update it as I add new mods, have new thoughts about existing mods, or retire some of the mods (down to the bottom of this list).