Yes, both ManageEngine OpManager and Grafana offer a Free Trial.
ManageEngine OpManager is designed for Large Enterprises, Medium Business and Small Business.
Grafana is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Grafana begins at $49/Month, while pricing details for ManageEngine OpManager are unavailable.
Some top alternatives to ManageEngine OpManager includes Site24x7, Zabbix, Ne.Mo. Network Monitoring, PRTG Network Monitor, Spiceworks Network Monitor, Nagios Network Analyzer, SolarWinds ipMonitor, ManageEngine NetFlow Analyzer, OP5 Monitor, SolarWinds Network Performance Monitor and NinjaOne (NinjaRMM).
Some top alternatives to Grafana includes iDashboards, DataHero, Databox, Klipfolio Dashboard, Prometheus, Splunk Cloud, SensorCloud, Chartbrew, SharpDash and Quickmetrics.