Logparser - Command line parser for common log format (Nginx default).
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
observIQ Cloud - The intuitive log management platform that you actually want to use.
Logmatic - Logmatic is a log centralization, analytics & visualization platform to improve software & business performance.
Bulletlog - Aggregate logs, discover and fix errors in real time
log4net - log4net is a tool to help the programmer output log statements to a variety of output targets.