Structured, pluggable logging for Go.

APM, Application Performance Monitoring System

Fast C++ logging library.

Like Prometheus, but for logs.

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)

GoFrame is a modular, powerful, high-performance and enterprise-class application development framework of Golang.

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

Zero Allocation JSON Logger

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.

Main Sigma Rule Repository

Log file navigator

Free and open log management

NLog - Advanced and Structured Logging for Various .NET Platforms

Fast persistent recoverable log and key-value store + cache, in C# and C++.