Best Free Open-Source Monitoring Software

Self-hosted open-source monitoring and alerting for DevOps teams

Composable observability platform

Agent for collecting, processing, aggregating, and writing metrics, logs, and other arbitrary data

Real-time system monitoring and performance troubleshooting

A system for building agents that monitor and act on your behalf

Self-hosted uptime and status page

Monitoring system and time series database

Scalable, cost‑effective log aggregation for modern DevOps

Fast, header-only C++ logging library for high-performance applications

Elegant, structured logging for Go applications

Open-source APM for cloud‑native microservices

Advanced Node.js process manager for production environments

Simple and easy-to-use Python logging library

Real-time global monitoring and alerting system

Fast, structured, leveled logging for Go applications

Cross‑platform real‑time system monitoring for admins and DevOps