Network Monitors

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

Free and open-source tool that monitors all network activity, blocks unwanted connections, uses filter lists for ads and malware, enforces DNS-over-TLS, and sets custom app rules.

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.

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.

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

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

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.

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

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

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

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

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.

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.

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.

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

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.

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

Easily switch between up to 6 network profiles with support for IP, DNS, gateway, WINS, printer, network drives, NIC status, scripts, and more for Windows.

Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. Since its inception in 2012, many companies and organizations have adopted Prometheus, and the project has a very active developer and user community.