ParryWinkle on 21 April 2014
The Elder Scrolls IV: Oblivion
The Elder Scrolls III: Morrowind
Arx Fatalis
Fallout New Vegas
Kingdoms of Amalaur
The Witcher series (sorta)
Two Worlds series
Dragon Age (sorta)
I'd highly recommend Morrowind and Oblivion, though. Of course, they're like Skyrim but more challenging and better mods, especially for Morrowind.
EDIT: Arx Fatalis is also very, very fun with mods but it's also good without mods.
