Plato: There is the Divine Good (or the One), which is the greatest of the Forms. There is also the Demiurge which fashioned the imperfect material universe.
Aristotle: There is the Unmoved Mover, a completely Formal being that is completely actualized that all objects in the universe try to become and actualize towards.
Epicureans: The Gods exist and are made up of atoms. Everything is made up of atoms and the void.
Stoics: There is a completely material universe with a fiery reasoning substance called Logos that pervades all of it. In short, you can call the Universe God.
Cynics: did someone mention DOG? I like dogs. They’re very important beings to emulate.