Gauri Thapa ATB generates a topology file for the submitted molecule. The level of accuracy of the force field parameters depends on the size of the molecule. Note that, it might generate parameters but it has to be verified first beforehand using it for specific systems. For example, there are a lot of various force field parameters that can be found for glucose in ATB but the reliable one is this (follow the link: https://atb.uq.edu.au/molecule.py?molid=461) because the solvation free energy is close to the experimental values. ATB can't generate proper force field parameters for ionic liquids (based on my previous experience).