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emailOpen Source Monitoring Tool.
Open source monitoring tool with support for multiple users.
Monitor Docker Logs and send Notifications.
LoggiFly - A Lightweight Tool that monitors Docker Container Logs for predefined keywords 
or regex patterns 
and sends Notifications.
Never miss critical container events again - Get instant alerts for security breaches, system errors, or custom patterns through your favorite notification channels. 
Modern web-based UPS monitoring system with real-time data visualization, alerts, and comprehensive reporting. Docker-ready with multi-architecture support.
Nutify is a comprehensive monitoring system designed to track the health and performance of your Uninterruptible Power Supply (UPS) devices. It provides real-time insights into critical UPS metrics, allowing you to ensure the continuous operation and protection of your valuable equipment. Nutify collects data, generates detailed reports, and visualizes key parameters through interactive charts, all accessible via a user-friendly web interface.
Network Top -- Help you monitor network traffic with bpf.
netop is a terminal command line interface that can customize the
network traffic bpf filter rule 
.
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SSL certificate expiry monitoring.
Ensure the continued security and reliability of your website by staying vigilant about SSL certificate expiration.
Sysmon for Linux is a tool that monitors and logs system activity including process lifetime, network connections, file system writes, and more. Sysmon works across reboots and uses advanced filtering to help identify malicious activity as well as how intruders and malware operate on your network. Sysmon for Linux is part of Sysinternals.
Syncthing Multi Server Monitor stylized as sm² (or sm2 for convenience).
Monitor multiple syncthing instances while using as little diskspace(docker image size) & memory while doing it.
Web UI for smbstatus to display current active connections, sessions and locked files for your samba shares.
This is a Flask-based web application that monitors Samba (SMB) connections using smbstatus and sends notifications to Discord and/or ntfy when a new client connects. It also provides a simple web dashboard to display active sessions, services, and locked files.
WIFI / LAN intruder detector. Check the devices connected and alert you with unknown devices. It also warns of the disconnection of "always connected" devices
select * from logs;
Open source SIEM for instant log insights, powered by DuckDB. Analyze millions of events in seconds, right from your terminal.
The Kubernetes Monitoring Helm chart makes it easy to start gathering telemetry data from your Kubernetes clusters. With one deployment, you can capture all of the metrics, logs, traces, and profiles from your cluster and the applications running on it!
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The Shadow Library Uptime Monitor.
This dashboard tracks the availability of popular shadow libraries in real time from a US-based server.
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Dynamic Dashboard for Nginx Proxy.
Dashly is a lightweight, real-time dashboard for users of Nginx Proxy Manager. It simplifies how you monitor and organize your services by automatically syncing with your NPM database. This means you never have to manually edit dashboard configuration files like YAML—it dynamically tracks and displays all your services based on their domain configurations in NPM.
Simple, lightweight server monitoring.
Beszel is a lightweight server monitoring platform that includes Docker statistics, historical data, and alert functions.
It has a friendly web interface, simple configuration, and is ready to use out of the box. It supports automatic backup, multi-user, OAuth authentication, and API access.
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A TUI tool for a live view of your docker containers running on a remote server.
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Open Source & Cross-Cloud Compliance & Security. Costs saving & Optimization.
Kexa's simple rules (Open Source) make it easy to monitoring and manage alerting of your entire cloud. With various monitoring and alerting options, instant and detailed alerts, easy-to-deploy and low in infrastructure costs, in turns complexity into simplicity.
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Easily ask questions about your Linux, Windows, and macOS infrastructure.
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Flower is an open-source web application for monitoring and managing Celery clusters. It provides real-time information about the status of Celery workers and tasks.
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Flower et observabilité @ Olivier DUVAL's LinkedIn 
A file watching service.
Watches files and records, or triggers actions, when they change.
Watchman exists to watch files and record when they change. It can also trigger actions (such as rebuilding assets) when matching files change.
The Open Source & Self Hostable RMM.
NetLock RMM is a full-featured Open-Source RMM for self-hosting or managed in the NetLock Cloud. With support for multiple clients, multiple languages and even more powerful features such as a antivirus management system.
NetLock RMM is an Remote Monitoring & Management (RMM) software built for Managed Service Providers, with a future focus on cybersecurity. NetLock RMM is primarily written in C#, Blazor, ASP.NET Core, and SignalR.
NetLock RMM can be deployed in various environments, including cloud setups or isolated/offline configurations. It supports multiple operating systems, including Windows and Linux, and can also run within Docker & Kubernetes, providing flexibility for different deployment preferences.