sawmill.net: Sawmill is a universal log analysis/reporting tool for almost any log including web, media, email, security, network and application logs.
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Prometheus Alternatives
Prometheus is described as 'Open-source systems monitoring and alerting toolkit originally built at SoundCloud. Since its inception in 2012, many companies and organizations have adopted Prometheus, and the project has a very active developer and user community' and is a Network Monitor in the network & admin category. There are more than 50 alternatives to Prometheus for a variety of platforms, including Linux, Web-based, Windows, SaaS and Self-Hosted apps. The best Prometheus alternative is Datadog. It's not free, so if you're looking for a free alternative, you could try HyperDX or Splunk. Other great apps like Prometheus are Graylog, InfluxDB, Grafana Loki and Kibana.