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Since I use Coordinate Reference Systems on a daily basis I have to search them for different reasons (usually because a customer is using the wrong one). I decided to develop a webpage to search them quickly, and get useful information. A few months later we moved it into the PROJ.org domain.
You have it at https://crs-explorer.proj.org/
Now there is not a single day I do not use it. It was worth it the investment.
@jjimenezshaw what's the new features compared to epsg.io, sr.org, projest.io etc?
@wildintellect First: it is up to date, with every version of PROJ (released every 3 months). sr.org is very outdated. epsg.io was very outdated when I did it, and it had some mistakes (and it is not the official from EPSG). I tried projest.io right now, and it is not working. Second: completeness. It includes exactly all the CRSs from PROJ, including EPSG, ESRI, IGNF, etc, and in WKT2! Third: it makes easy to find a CRS due to different criteria. Fourth... I am running out of chars ;)