I can't find what other 'on hit' effects are in Diablo 3. I know of knockback and life on hit.
The existing on-hit effects are
- Mana (WD only)
Of these +life and +mana are unique in the fact that they always work; the others only come in the form of "chance to" affixes. I've excluded life steal from this list because it isn't formally "per hit".