Yes, both Nagios XI and Datadog APM offer a Free Trial.
Nagios XI is designed for Large Enterprises, Medium Business and Small Business.
Datadog APM is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing details for both Nagios XI and Datadog APM are unavailable at this time. Contact the respective providers for more information.
Some top alternatives to Nagios XI includes Zabbix, Ne.Mo. Network Monitoring, PRTG Network Monitor, Spiceworks Network Monitor, Nagios Network Analyzer, SolarWinds ipMonitor, Netcrunch, OP5 Monitor, SolarWinds Network Performance Monitor, Checkmk and NinjaOne (NinjaRMM).
Some top alternatives to Datadog APM includes Retrace, Scout APM, New Relic APM, Nastel AutoPilot, AppDynamics, Dynatrace, Instana, Thundra APM and APImetrics.