@jjimenezshaw has been kicking coordinate system ass lately. Besides the wonderful crs-explorer.proj.org, he recently revamped https://spatialreference.org to be a statically generated, blazing fast, GitHub pages hosted, website based on PROJ/PyPROJ. If you want to see how it works or host your own, jump on the repo at https://github.com/OSGeo/spatialreference.org/
Thank you so much Javier!