Any SPS model can be used to generate an age-metallicity grid. We provide scripts for generating grids for the following:
For BC03 and BPASS you need to download the original spectra from the respective home pages.
For FSPS you can simply run the script as-is. You will need python-FSPS, astropy and numpy installed.
cd grids python grid_fsps.py
This will generate two grids, one including the nebular contribution from young stars and one without (See Byler+17 for details on how the nebular contribution is calculated self-consistently in FSPS).