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Thruk is a multibackend monitoring webinterface for Naemon, Nagios, Icinga and Shinken using the Livestatus API.

Developer-first error tracking and performance monitoring

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. It has a robust event-based programming language which provides protection from a range of attacks against web applications and allows for HTTP traffic monitoring, logging and real-time analysis.

Kegbot Server, the internet beer kegerator monitoring system.

Ubilling is an open-source billing system designed for Internet service providers (ISPs). It provides tools for managing subscribers, handling payments and creating detailed reports. Ubilling allows control and monitoring of a wide range of network equipment and can be easily extended with custom functionality.

The Prometheus monitoring system and time series database.

Patchman is a Linux Patch Status Monitoring System

Zuul is a gateway service that provides dynamic routing, monitoring, resiliency, security, and more.

Performance monitoring tools for Linux

Realtime PHP monitoring system which aggregates and displays Pinba data.

OMD - Open Monitoring Distribution Labs Edition.

OSSEC is an Open Source Host-based Intrusion Detection System that performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response.

Community-based GPL-licensed network monitoring system

Better Living Through Statistics: Monitoring Doesn't Have To Suck

Cross-platform lib for process and system monitoring in Python

SQL powered operating system instrumentation, monitoring, and analytics.

An environmental monitoring and regulation system

CUP, common useful python-lib. (Currently, Most popular python lib in baidu). Python 开发底层库, 涵盖util、service(threadpool/generator/executor/cache等等)、logging、monitoring、增强型配置 等等库支持

Web-based Traffic and Security Network Traffic Monitoring

Open-source cron job and background task monitoring service, written in Python & Django

Home server monitoring API and backend for Monitee

Open source framework for processing, monitoring, and alerting on time series data

APM, Application Performance Monitoring System

Lightweight self-hosted web control panel & dashboard for Raspberry Pi — system monitoring, GPIO, services, processes, command buttons with HTTP API, and SSH execution. Open-source Webmin/Cockpit alternative for homelab.

Datadog Go Library including APM tracing, profiling, and security monitoring.

Detours is a software package for monitoring and instrumenting API calls on Windows. It is distributed in source code form.

AWS Inter-Region Latency Monitoring

Open Vehicle Monitoring System - Version 3

Climate indices for drought monitoring

Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. It includes our own interfaces for alerting, dashboards, hunting, PCAP, detections, and case management. It also includes other tools such as osquery, CyberChef, Elasticsearch, Logstash, Kibana, Suricata, and Zeek.