Look under the Mods sticky thread, at the top of the page, for an idea of the kinds of things mods can add to gameplay.
THe best meta list of mods I've seen is
Mythic Mods. I would especially recommend checking out Telesphoros' List 'O Mods, a category under Mythic Mods.
If you want recommendations or advice about something you see and can't find it under our sticky thread above, then ask in this forum.
