BareTail - BareTail is a real-time log file monitoring tool. Features Real-time file viewing
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
Log Transformer - Monitor log files in real time using customized filter and formatting rules. Use regular expressions to apply color and formatting. Go even further by filtering out unwanted text or lines. https://logtransformer.com
Logmatic - Logmatic is a log centralization, analytics & visualization platform to improve software & business performance.
Event Log Explorer - Windows event log viewer software. Windows event log analysis, view and monitor security, system, and other logs on Windows servers and workstations
log4net - log4net is a tool to help the programmer output log statements to a variety of output targets.