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Yes, both Splunk Enterprise and Sensu offer a Free Trial.
Splunk Enterprise is designed for Large Enterprises and Medium Business.
Sensu is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Splunk Enterprise Starts at $150/Month whereas for Sensu Starts at $3/Month.
Some top alternatives to Splunk Enterprise includes Reveal, Sprinkle Data, Data Monkey, Knarr, Iteratively, Splunk Cloud, Easy Insight, dataSights, Squirro Service Insights and Data Suisse.
Some top alternatives to Sensu includes Nagios XI, Zabbix, Grafana, Prometheus, Zenoss, Log Owl, Cloudzatic, Qualified, Workvivo, Senso.cloud, SharpDash and InsightOps.