Ok, I've started getting the Summoned creatures lineup sorted out... Here's what I"ve got so far:
Summons; Generated by game or civ-specific small wonders:
FFI & FFII "Good" civs (Light warriors and Fynn Alliance): Archangel (Shiro's Archangel), produced by the Sacred Order of Light SW which is available through the unique tech, Divine Intervention.
FFI & FFII "Bad" civs (Dark Warriors and Paramekian Emprie): Daemon (Kinboat's Balrog), produced by the Chaos Shrine SW available through the unique Daemonology tech
FF III: Undecided
FF IV (Baron): Odin, Produced by as yet to be determined SW the tech for which also needs to be named
FF V (Tycoon): Undecided
FF VI (Vector Emprie and Returner Alliance): Undetermeined summon produced by the Esper Statues SW which requires the Magicite unique tech.
FF VII (Shinra): Produces a Sephiroth Clone (Shiro's One-Winged Angel) from a Jenova Project SW which requires the Shinra Soldier Program unique tech.
FF VII (AVALANCHE): Bahamut Zero (Kinboat's Black Dragon) produced from a Huge Materia SW that requires the Unique tech Summon Materia.
FF VIII (Galbadia, Garden and Esthar): As yet undetermined summon produced by a yet to be named SW requiring a unique tech either called Guardian Forces or Para Magic.
FF IX (Lindblum and Alexandria): a Ramuh summon (made by yours truly) is produced by a SW called the Eidolon Wall which requires the Eidolons unique tech.
FF X (Al Bhed and Yevon): Most likely a Yojimbo (Kinboat's Kensai) summon produced by a Temple of the Fayth (or something like that) SW, which requires the Farplance unique tech.
FF XI (Bastok, Selbina, San d'Oria, and Windhurst): Most likely a Garuda summon (Aaglo's Keeper of the secrets) produced by a yet to be named SW requiring a unique tech called Avatars
FF XII, Tactics and Tactics Advanced (Archades, Dalmasca, Lesalia and Bervenia): A summoned unit called Ultima (Kinboat's female angel) will be produced by a SW called The Zodiac Stones which requires a tech called Totemas (that way I can kind of tie the Zodiac Braves/Totemas/Espers from the three World of Ivalice games, since most of the Zodiac Braves (including Ultima) also appear as Totemas in Tactics: Advanced and Espers in XII)
FF CC: No Idea
Orcs: No Idea
Dwarves: Dwarf Lord (Aaglo's Rune Smith) produced by a Hall of the Mountain King SW that requires the unique tech Dwarven Rune Lore.