Yes, both Nagios XI and TaskCall offer a Free Trial.
Nagios XI is designed for Large Enterprises, Medium Business and Small Business.
TaskCall is designed for Large Enterprises, Medium Business and Small Business.
The starting price of TaskCall begins at $9/User/Month, while pricing details for Nagios XI are unavailable.
Some top alternatives to Nagios XI includes NinjaOne (NinjaRMM), Zabbix, Ne.Mo. Network Monitoring, PRTG Network Monitor, Spiceworks Network Monitor, Nagios Network Analyzer, SolarWinds ipMonitor, Netcrunch, OP5 Monitor, SolarWinds Network Performance Monitor and Checkmk.
Some top alternatives to TaskCall includes Freshservice, PagerDuty, xMatters, VictorOps, YetiCloud, Spike.sh, Lightstep Incident Response, Mission Manager, Incident.io, StatusCast Incident Management and ResQ.