Postgres comes packed with extensions just waiting to be enabled!
To see a list of those extensions:
select * from pg_available_extensions;
This will list the extension's
installed_version, and the
comment which is a one liner description of what the extension does.
Here's an interesting one for example:
name | earthdistance default_version | 1.1 installed_version | ø comment | calculate great-circle distances on the surface of the Earth
To enable an extension, simply call
create extension on the name:
create extension if not exists earthdistance;