I would propse to also explain how to cite NIFTy with the help of BibTeX. To be honest the How-to-cite instruction is not too helpful after all if one uses BibTeX.
In the LaTeX document class \documentclass[conference]{IEEEtran} the bibliography entry looks like this when using my proposed BibTeX entry:
Martin Reinecke, Theo Steininger. NIFTy – Numerical Information Field TheorY. Version nifty4. Feb. 5, 2018. URL : https://gitlab.mpcdf.mpg.de/ift/NIFTy.
@ensslint, is this okay? Shall we change something?