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.

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

TaskExplorer is a powerful system task-manager / process-inspector tool designed for Windows that goes well beyond the capabilities of the built-in Task Manager. It provides real-time insights into running processes, threads, open handles, network sockets, memory usage, modules loaded, and more — all in a unified, fast, and efficient GUI. Rather than scattering information across tabs or dialogs, TaskExplorer displays detailed data in a panel layout: when you select a process, the lower panel updates dynamically to show relevant info (threads, handles, sockets, modules, etc.), making deep inspection quick and intuitive. It includes advanced panels: a Thread Panel with stack traces (helpful for diagnosing deadlocks or hangs), a Memory Panel that lets you view or even edit process memory (with search capabilities), a Socket Panel showing open network connections, data rates, pseudo-UDP connections (via ETW), and a Modules Panel listing all loaded DLLs and memory-mapped files.

Monitoring Plugins is a collection of open-source plugins designed to work with Nagios and other monitoring systems. These plugins perform various checks on hosts and services, providing administrators with essential information about system health and performance. The suite includes a wide range of plugins written in C, Perl, and other languages.​

This Solaris system monitoring tool allows to perform standard SAR activity reporting and NMON activity reporting. The NMON output can be imported with Excel or RRD to output simple and efficient graphs.

BCC is a toolkit that simplifies creating efficient kernel tracing, monitoring, and manipulation programs by leveraging extended Berkeley Packet Filters (eBPF). It includes a rich set of example tools and scripting interfaces in C, Python, and Lua. BCC makes BPF programs easier to write, with kernel instrumentation in C (and includes a C wrapper around LLVM), and front-ends in Python and lua. It is suited for many tasks, including performance analysis and network traffic control. With a BPF-specific frontend, one should be able to write in a language and receive feedback from the compiler on the validity as it pertains to a BPF backend. This toolkit aims to provide a frontend that can only create valid BPF programs while still harnessing its full flexibility.

CodeCampus OS is a custom Linux distribution based on Ubuntu 24, designed for beginner developers, computer science students, and self-learners who want to start coding without friction. Unlike traditional setups that require hours of installation and configuration, CodeCampus provides a fully pre-configured, learning-first environment right out of the box. From the moment you boot, everything is ready—so you can focus on learning, experimenting, and building instead of troubleshooting. CodeCampus solves this by removing setup complexity and providing a ready-to-use development environment that lets you start coding immediately. 👉 Getting started guide: https://codecompasss.github.io/code_campus_userguide/getting-started/

FlexMon is a flexible system monitoring system for Unix. In a client-server framework, plugins for e.g. load average, process status, disk status, CPU fan/temerature are provided. A command-line client exists, with a GUI and CGI interface to come.

Linux Monitor is system monitoring software for linux. Linux Monitor has client and server programs to monitor remote services(HTTP,SMTP,IMAP and NNTP). All "errors" are stored to database and viewed using cgi-scripts.

Library to handle drawing on cheap 84x48 LCD (PCD8544 controller) used in some Nokia mobile phones (for ex. 3310, 3330, 3210) via LPT port. Contains some demostration software. May be used in various applications: pc modding, system monitoring etc.

System monitoring utility, written in plain C. Allows application execution and performance monitoring, saving results into XML files. Monitors CPU, memory, network and disk usage on a per-application or per-system basis.

For real-time, high speed, mission critical packet capturing without suffering any packet drops during high packet rates with relatively modest desktop hardware. Applications in: real-time network or large system monitoring or clustered systems.

This tool shows same like top plus coloured information about processes which have to run and such not have to run. It was planned, but not implemented yet, to stop automatically processes not in the database and restart those died by accident, core dump whatever.

XMLSysInfo (XSI) is a system monitoring daemon that replies to network queries with vital system information and statistics in an easily parsed XML format. It supports all the major BSDs, Linux and Solaris.

A console based ncurses system monitoring application that provides a visually appealing overview of system utilization in real-time. It uses the libstatgrab library, and it was inspired by other monitoring tools such as wavemon, statgrab, and gkrellm.

X11-based graphical system monitoring tools in the spirit of xload.