Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Serilog - Backend Development and Utilities
Snare - Snare is well known historically as a leader in the event log space.
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
Kafka - Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.
Sejil - Capture, view and filter your ASP.net core log events right from your app