Logmatic - Logmatic is a log centralization, analytics & visualization platform to improve software & business performance.

Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.

Serilog - Backend Development and Utilities

Kafka - Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.

LogTailApp - LogTail is a local and remote (SSH) log file viewer and monitoring application for Mac OS X. It is a pure, modern, document-based Cocoa App

Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.