Zabbix

Zabbix offers flexible pricing options tailored to different needs. Their basic version is open-source and free to use, providing robust monitoring features. For users needing additional support, Zabbix offers paid technical support subscriptions with varying levels: Silver, Gold, and Platinum. These plans provide services like priority support, access to Zabbix experts, and training. Pricing for these plans depends on the number of supported devices and the level of service required​.