PostGIS

Install PostGIS

For Mac OS X, it's easiest to download and install Postgres.app, which includes a PostgreSQL server including PostGIS package. After installation, you have an icon in the status bar to start and stop the PostgreSQL server.

pgsql can be found in /Applications/Postgres.app/Contents/Versions/9.4/bin or started via the status bar icon. Postico is a nice graphical PostreSQL client.