Docu: https://docs.netgate.com/

Zabbix: https://www.zabbix.com/ru/integrations/pfsense

CE iso:
https://repo.ialab.dsu.edu/pfsense/
https://atxfiles.netgate.com/mirror/downloads/
https://pfsense-isos.nationalcdn.ru/

Repo:
https://pfsense.nationalcdn.ru/