Was thinking about that as I was posting this status actually. Not a structured one. I should probably make one. I have a list of the best Star Wars character models and go-to mods on my clan's website. But yeah, should make a page for mods for SP and MP for both games.
Well, JKA modding is way easier than KOTOR modding, I can tell you that. xD Though if you've never played any of them before, I recommend using no mods for your first time playing singleplayer. Maybe thats just me.
This inspired me to create a list of mods, so hopefully I get that finished soon.