Open Source C# System Monitoring Tools

Process Hacker is a free and open source process viewer. This multi-purpose tool will assist you with debugging, malware detection and system monitoring.

Libre Hardware Monitor is a free, open-source system monitoring tool that provides detailed insights into your computer’s hardware health and performance. It tracks real-time metrics such as temperatures, fan speeds, voltages, clock speeds, and load across a wide range of components. The project includes both a Windows Forms application for visual monitoring and a reusable library for developers who want to integrate hardware monitoring into their own software. LibreHardwareMonitor supports modern Intel and AMD CPUs, major GPU vendors, storage devices, and network adapters. Built on modern .NET versions, it continues to evolve with frequent updates and broad community contributions. Licensed under MPL 2.0, it offers a transparent and extensible alternative to proprietary hardware monitoring tools.

File system/directory monitoring utilities with loggin and task processing support (can execute files or make a WCF service call). Multiple configuration options. Source code libraries can be used to create a custom file system monitor.

Argus Monitor is a powerful fan-control and system-monitoring tool that gives you complete control over cooling behavior across your entire PC. It allows you to manage CPU, GPU, motherboard, and AIO fans using fixed values or advanced temperature-based control curves sourced from any sensor in your system. With multi-controller support, fan profiles, hysteresis, and temperature averaging, Argus Monitor offers smooth, precise fan adjustments with minimal noise fluctuation. The software also includes robust temperature monitoring for CPUs, GPUs, SSDs, RAM, and additional sensor channels. For supported devices, it provides RGB control as well as gadget and tray-icon displays for quick system insights. Lightweight, stable, privacy-respecting, and fully customizable, Argus Monitor is one of the most comprehensive PC cooling and monitoring solutions available.

Opserver is a full-stack monitoring system originally developed by the Stack Exchange engineering team to provide deep operational visibility across large-scale production environments. It functions as a centralized dashboard capable of independently monitoring servers, databases, caches, and network components while aggregating them into a unified operational view. The platform supports a wide range of integrations including SQL Server, Redis, Elasticsearch, HAProxy, and external monitoring systems, making it highly extensible. Built on .NET technologies, Opserver can run across multiple operating systems and is designed for environments that require both infrastructure metrics and application-level diagnostics. It emphasizes real-time status visualization combined with drill-down capabilities for troubleshooting complex distributed systems.

SysGauge is a powerful system monitoring and performance analysis tool for Windows that delivers deep insights into your computer’s operation. It provides real‑time visualization of key metrics across multiple domains: CPU and memory usage, disk I/O, network traffic, and active processes. The application features a customizable dashboard with live graphs, gauges, and tables, letting you track trends and spot bottlenecks at a glance. SysGauge supports historical data logging for post‑analysis and capacity planning, and offers alerting for critical conditions (e.g., high CPU load, low disk space). It includes advanced process monitoring with detailed resource breakdowns, service status checks, and network connection tracking.

A system monitoring application, that provides monitoring on different system areas by using small monitoring plugins - each plugin monitors a very specific system area.

Simple - yet powerful and extendable - system monitoring daemon, written completely in managed C#. User interfaces can be attached using various protocols, and new modules (written in any .NET language) can easily be linked to the core monitoring engine.