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Demo - 3
Mag - 2
All other Builders - 1
Walls
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All Walls feed 1 gold, doesn't matter the upgrade
Research Centers
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All RC's feed 3 gold
Advanced Research Center
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Pir, Troll, Fae, Rad, Nat, Mur, Dryad, Gob, Ogre - 3
Morph, Demo, Mag, Drae, Taur - 5
Merchant
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All Merch's feed 3 gold
Food Sources
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All Food Sources feed 2 gold except Gob's and Rad's feed 1
Towers
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All Towers feed 1 gold even upgraded, Only Taurens tower feeds 4 gold
Demo's Summons
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Hound - 1
Spider/Arach - 1
Overlord - 1
Belth - 45

Merch Summons
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All 1 gold
Titan Hunter's
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All feed 20 gold
A Builder
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Feeds 10 gold
Ultimate Towers
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Mag's Ice Palace - 4, Deep Freeze 2
The rest are 1
Harvesters
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Demo's - 1, The Demonic Fiend - 5
Mag's - 2
The rest of the Harvesters don't feed gold
Extra
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A typical pub base contains 12 Walls, 35 Towers, a RC, 5 shelters, and a ARC or Merch which feeds - 58 gold
Demo's Pool of Ancient Ritual - 3
If someone wants to add how much exp or lumber it they feed free to do so