* [PostgreSQL](https://www.postgresql.org) (9.3+ will work, 11+ strongly recommended)
* [PostGIS](https://postgis.net) (2.2+)
- * [Python 3](https://www.python.org/) (3.5+)
+ * [Python 3](https://www.python.org/) (3.6+)
* [Psycopg2](https://www.psycopg.org) (2.7+)
* [Python Dotenv](https://github.com/theskumar/python-dotenv)
* [psutil](https://github.com/giampaolo/psutil)
* [Jinja2](https://palletsprojects.com/p/jinja/)
* [PyICU](https://pypi.org/project/PyICU/)
+ * [PyYaml](https://pyyaml.org/) (5.1+)
* [datrie](https://github.com/pytries/datrie)
* [PHP](https://php.net) (7.0 or later)
* PHP-pgsql