A large part of my research involves generating mock observations of simulations. To that end, I have written code that takes a snapshot from Gadget 2 simulation and generates mock data cubes, images, velocity maps, dispersion maps, and velocity profiles. To be clear, this code is mainly designed to work with tailored simulations where the initial conditions are supplied by GalactICS. The featured image of two interacting galaxies was generated using this visualization software.
The code is available here. It is written in Fortran, and requires openmpi and the cfitsio libraries to run.