Grafana, Graylog, Sentry, Splunk, Datadog, Prometheus, Bugfender, Kibana, Fluentd, Humio, Logstash, Better Stack Logs, LogDNA, Logentries, Timber, Scalyr, Open Web Analytics, Moesif, Logmatic.io, OTUS SIEM, Hindsight, RST Cloud, S4NITY, Log Collector, Devo are some alternatives to Papertrail.