Fast C++ logging library.

Structured, pluggable logging for Go.

Like Prometheus, but for logs.

APM, Application Performance Monitoring System

Blazing fast, structured, leveled logging in Go.

Sends your logs to files, sockets, inboxes, databases and various web services

Python logging made (stupidly) simple

Never use print for debugging again

Logstash - transport and process your logs, events, or other data

A fast & simple, yet powerful & flexible logging framework for macOS, iOS, tvOS and watchOS

Fluentd: Unified Logging Layer (project under CNCF)

A powerful framework for faster, easier, and more efficient project development.

A tiny JavaScript debugging utility modelled after Node.js core's debugging technique. Works in Node.js and web browsers

Zero Allocation JSON Logger

Main Sigma Rule Repository

The POCO C++ Libraries are powerful cross-platform C++ libraries for building network- and internet-based applications that run on desktop, server, mobile, IoT, and embedded systems.

Log file navigator

Free and open log management

Realtime log viewer for docker containers.

Fast and Lightweight Logs and Metrics processor for Linux, BSD, OSX and Windows