This page features mock observations for HST and JWST from supercomputer simulations, roughly the same size as the Hubble Ultra Deep Field region, or individual fields of more recent UDF-style campaigns (like the XDF, HUDF09/12, and the Frontier Fields). You can use your mouse cursor to zoom into individual regions and check out the simulated galaxy populations. Models are from the Moving Mesh Cosmology project. Appears to work best in Firefox.

For now, just an example, in roughly R, Z, J bands (HST ACS/F435W, ACS/F850LP, WFC3/F160W). Works okay in Firefox, but seems to have trouble with scrolling in Chrome or Safari.

Same field, in roughly F115W, F200W, F356W filters for JWST's NIRCAM. Nearby universe has been subtracted.