non-canon clerics with spontaneous casting abilities
Shaman, from the Green Ronin "Shaman Handbook" . Fairly complicated spell acquisition and limited turning ability. No domain powers. Cha-based (spirit interaction). Medium fighting ability - basically a variant druid. This might need some consultation with your GM about its feasibility in a campaign.
Witch, from the Green Ronin "Wiches Handbook". Arcane caster with healing spells (but a rather specific, thematically restricted spell list). No turning ability - gets a familiar. Wis-based. Little fighting ability. Interesting, but will need some adaption and expansion by the GM in all likelihood, to flesh out spell list. Might not fit in every camapaign, either.
Faith Caster - from Fantasy Flight Games "Path of Faith". Entirely spontaneous cleric, but no turning and limited access to domain spells, if not in choice of domains. Wis based. Little fighting ability - akin to a sorcerer. Basically a sorcerer/cleric mix, as proposed above.