I highly recommend acquiring Viking Invasion, and/or the Battle Collection if you're able to. For one thing, almost every single mod out there requires you have VI installed. For another, though, VI just adds so much to the original game; you're doing yourself a disservice by not picking it up!

That said, the only major mod that's available for 1.1 is Wes' MedMod (it's located at the bottom of the page). It's an excellent mod, however, and comes highly recommended by many MTW players. Enjoy!