Top MONITOR GitHub Repositories & Tools (2026)

Add-on agent to generate and expose cluster-level metrics.

A cross-platform file change monitor with multiple backends: Apple macOS File System Events, *BSD kqueue, Solaris/Illumos File Events Notification, Linux inotify and fanotify, Microsoft Windows and a stat()-based backend.

The open source error catcher that's Airbrake API compliant :ukraine:

Self-hosted Laravel monitoring agent. Drop-in Nightwatch alternative, open-source.

Distributed tracing without code changes. 🚀 Instantly monitor any application using OpenTelemetry and eBPF

Free, open-source menu bar toolkit for macOS. Eighteen tools in one panel: Pomodoro timer, time tracker, keep-awake, system monitor, clipboard history, file converter, window manager, torrents, archives, OCR, screenshots, draw on screen, color picker, VPN switcher, app launcher, uninstaller, keyboard lock, speed test. SwiftUI, no telemetry, MIT.

A process for collecting metrics using JMX MBeans for Prometheus consumption

JavaMelody : monitoring of JavaEE applications

Real-time monitoring for Plex, Jellyfin, and Emby servers. Track streams, analyze playback, and detect account sharing from a single dashboard.

Free, open-source application firewall for macOS. Little Snitch alternative with zero telemetry. Native SwiftUI world map, rules manager, DNS over HTTPS, pf-based blocking. Signed, notarized, MIT licensed.

Self-hosted AI visibility tracking (AEO / GEO / LLMO). Track how ChatGPT, Claude, Perplexity, Gemini and Google AI Overviews mention and cite your brand. One Go binary, SQLite, MCP-first, bring your own keys.

Exceptionless application

Checkmk - Best-in-class infrastructure & application monitoring

CLI for managing Dynatrace platform resources - built for humans and AI agents alike

The developer tools panel for WordPress and WooCommerce

The only tool you need to know what is happening and how to fix it.

Watcher - Open Source AI-powered Cyber Threat Intelligence & Hunting Platform. Developed with Django & React JS.

Lightweight, self-contained Linux® server monitoring tool

Web-app for processing, logging and visualising energy, temperature and other environmental data

Percona Monitoring and Management: an open source database monitoring, observability and management tool