Kiwi Syslog Server - Kiwi Syslog Server prvides solution to centralize and simplify log message management across network devices and servers.
log4net - log4net is a tool to help the programmer output log statements to a variety of output targets.
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
Logary - Professional logging metrics and analytics for your apps