A mod that allows you to revive yourself and others at the cost of either health, experience, food, items, or nothing.

Let's you also control the amount of health and food the revived player will have.

Fallen players move slowly, and can't interact with anything.

Can now see how much you have for the revive requirement, and how much you will have after
There are now 3 dying poses: CROUCH, PRONE, and SLEEPING
Inventory interaction while dying now has 3 settings: NO, LOOK_ONLY, and YES

Can customize the potion effects given to a dying player.
Can now disable movement and jumping while in the dying state
Disables all modded keybinds while in the dying state
Self revive system: Either revive by chance or by losing a portion of stackable items
Can now blacklist commands whilst fallen
Compact fallen screen option
Items can now be used as a revive type
There's a /reviveme command that now revives players wherever they are
A /revivemefix command just in case the revive/fall code doesn't execute properly

If you don't like the way this mod handles revival, there are of course alternatives:

Cycro54

Invocore (Code Library)