Pegas Horse Ranch
This is definitely one of the most enjoyable mods I have tried.
It places a horse ranch just south of Vos. You can ride, buy, breed, train and
sell horses. The mod is also companion friendly. Companions will ride on the same horse with you, or they will ride their own mount. I suggest the latter; it looks better, but more importantly, if you have bought two horse of differing genders you can breed them.
Also, it is reasonable for lower end machines, I was expecting a hit in my FPS, but it has not been bad at all.
Check it out here:
http://www.highpressure-morrowind.co...rse_Ranch.html
It can be downloaded from TES (just check the "creatures" category)