Network Monitors

Foremost network protocol analyzer with multi-platform support, deep protocol inspection, VoIP analysis, and extensive file format compatibility.

Portmaster is a free and open-source privacy suite that puts you back in charge of your computer.

Free, open-source utility for network security auditing and exploration with capabilities for OS detection, service identification, and large network scans.

A free, powerful, multi-purpose tool that helps you monitor system resources, debug software and detect malware. Official successor to Process Hacker.

Monitor your CPU, Memory, Disk, Network and GPU usage.

TrafficMonitor is a network monitoring suspension window software in Windows. It can display the current network speed, CPU and memory usage. It also support the functions of display in the taskbar, change skin and historical traffic statistics.

Visualizes network activity, alerts on suspicious behavior, manages firewall rules, reports new app connections, and identifies potential threats.

Gather and analyze accurate statistics and performance metrics, visualize it, get notified about current and potential issues without delay, and take advantage of our time-tested professional development and support.

Resource monitor that shows usage and stats for processor, memory, disks, network and processes.

Network scanner discovers devices, monitors ISP performance, sets security checks. Use advanced tools to analyze settings and find hidden cameras.

Zenmap is the official cross-platform GUI for the Nmap Security Scanner. It is free and runs on Linux, Windows, Mac OS X, etc. Zenmap aims to make Nmap easy for beginners to use while providing advanced features for experienced Nmap users.

Advanced self-hosted tool for tracking uptime across multiple services with reactive UX, interval checks, various notifications, and multi-language support.

Sniffnet is a network monitoring tool to help you easily keep track of your Internet traffic.

An advanced Windows tool for internet traffic control and monitoring. Set speed limits for apps and connections, with real-time and long-term stats.

Firewall tool for monitoring, controlling, and alerting on outgoing network connections, with real-time user notifications and customizable rule-based access control.

Glances is a cross-platform monitoring tool which aims to present a large amount of monitoring information through a curses or Web based interface. The information dynamically adapts depending on the size of the user interface.

OpenSnitch is a GNU/Linux application firewall.

NetWorx is a simple, yet versatile and powerful tool that helps you objectively evaluate your bandwidth consumption situation. You can use it to collect bandwidth usage data and measure the speed of your Internet or any other network connections.

Netdata collects metrics per second and presents them in beautiful low-latency dashboards. It is designed to run on all of your physical and virtual servers, cloud deployments, Kubernetes clusters, and edge/IoT devices, to monitor your systems, containers, and applications.

Nagios is a powerful monitoring system licensed under Nagios Enterprises that helps organizations identify and resolve IT infrastructure issues.

Beszel is a lightweight server monitoring platform that includes Docker statistics, historical data, and alert functions.

Tiny Shield keeps your network safe by watching all connections and stopping bad stuff before it can harm your computer. Tiny Shield keeps an eye on everything your Mac connects to, making sure you can see all your internet activity in one place.

Monitor IT and DevOps environments with over 120 integrations, providing a unified view of your infrastructure with graphing, correlation, and analytics.

Spiceworks is a software suite for IT professionals to manage networks, troubleshoot issues, and handle IT tasks. It offers free online tools for network connectivity management, remote computer access, user activity monitoring, contract tracking, and inventory scanning.

Shodan is a search engine that lets you find specific computers (routers, servers, etc.) using a variety of filters. Some have also described it as a public port scan directory or a search engine of banners.