Ford 8.8 is another common rear axle.
Any of the crate axles can be purchased as direct bolt ins for a TJ. Rockcrusher, dynatrac, currie, tera CRD. Axles very from d44, d60, ford 8.8, ford 9", ford 9" hp, full floats, semi floats, etc etc etc.
There are about 20 axle manufactueres and builders with about 100 options per axle as to what goes in and on them.
As in you have about a million options with a question as broad as that.
Do you need bolt in?
What king of budget do you have?
Those two questions will help to significantly narrow your options down.
hth