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PROJ coordinate reference systems, fast and easy.
This is a page containing all the coordinate reference systems included in the open source library
PROJ.
It provides useful features, like filter by clicking on a map, by type (projected, geographic, vertical, etc), authority (EPSG, ESRI, IGNF, etc), searching by name, and more.
For
EPSG systems, it includes a direct link to their definition in their official page.
It has as well the WKT 1&2 definitions (as produced by PROJ).
Have a look at
all available systems, more than 13 100 so far.
You can see the source code in my
GitHub account.