Looking for atmospheric density models of various planets and moons, any sort of data/resources/database of this information would be extremely useful as I am working on recreating these models for simulations.
Depending on your needs, a simple exponential model could work. A list of various body's scale heights is available on Wikipedia.
At the opposite extreme, there are the GRAMs, Global Reference Atmospheric Model(s). These are the gold standard of atmospheric modeling (short of a few use cases), available for all bodies with significant atmospheres (Venus, Earth, Mars, Jupiter, Saturn, Titan, Uranus, Neptune).
You do have to officially request access to the GRAM software(s) from NASA and sign a "Software Usage Agreement" (cool or frightening or verbosely bureaucratic depending on how you look at it), but in my experience the process was pretty easy and relatively quick (a few days).