I've got one I made for my home-brew setting, but it's pretty generic.
Here's the overview:
Requirements:
Feats: Spell Penetration, Extend Spell
Skills: Knowledge (The Planes) 5 Ranks, Spellcraft 8 Ranks
Special: The ability to cast 3rd level spells, including Summon Monster III.
BAB: Poor (as Wizard)
Saves: Poor Fort, Poor Ref, Good Will
HD: 1d4 per level
Class Skills: Alchemy, Concentration, Spellcraft, Knowledge (any), Scry, Speak Language
2+Int modifier Skills points per level
Spellcasting Progression: +1 existing class every level
1: Linked Minds, Template Master
2: Channel Summon
3: Signature Summon
4: Faster Summoning
5: Summon Cohort
6: Greater Spell Penetration
7: Quicken Calling
8: Extension
9: Master Summoner
10: Blooded Summon
Linked Minds(Ex): Any creature the Summoner summons or calls shares his senses with the caster. This allows the caster to percieve anything the summoned minion percieves, and use that minions senses such as Blindsight, Tremorsense, Darkvision, Low-light Vision, and even a Devil's ability to see in darkness.
Template Master: Any creature summoned of the type Animal or Vermin may have any of the following templates applied to it: Celestial, Fiendish, Axiomatic, Anarchic, Elemental (Any).
*It is also reccommended that the DM allow the Summoner to summon any animal or vermin of equivalent CR to those summonable at each spell level.
Channel Summon(Su): Whenever the Summoner completes a summoning spell, he may cast any spell he has available, as a free action. The summoned creature (or creatures) must be the target, and if the effect would include other targets, those targets are exempt from the spell's effects.
Signature Summon(Ex): Choose a template from Template Master; whenever the summoner uses that template, maximize the summoned creature's hit points. The opposite template (Good vs. Evil, Law vs. Chaos, opposed element) may no longer be applied.
Faster Summoning(Sp): The summoner may cast summoning spells slightly faster. As a special standard action, he may cast a summoning spell. This action does not allow him to use his movement, but is completed on his current action.
Summon Cohort: The summoner gains a special version of the leadership feat. He may call a cohort (regardless of if he knows a calling spell) of CR equal to 2 less than his leadership score indicates the cohort's level would be (subject to DM approval).
Greater Spell Penetration: The summoner gains Greater Spell Penetration as a bonus feat.
Quicken Calling(Sp): Calling spells now take 1 full round to cast. They still require appropriate wards to contain the called creature, but the caster may forgo the wards if he is confident that the called creature will cooperate. In any case, at least one round must be spent bargaining with the called creature before it will act on the summoner's behalf.
Extension(Ex): Summoning spells now last for 1 minute per caster level instead of 1 round per caster level.
Master Summoner(Sp): Summoning spells now take a standard action to cast for the summoner. This replaces the normal casting time of 1 full-round.
Blooded Summon(Su): This is an improved version of the Template Master ability. The summoner may now apply the half-celestial, half-fiend, and half-elemental (any) templates to his summoned animals and vermin.
What do you think? Balanced?
-nameless