Best Free Network Assessment Tools

OpManager is a network management tool geared to monitor your entire network. Ensure all devices operate at peak health, performance, and availability. The extensive network monitoring capabilities lets you track performance of switches, routers, LANs, WLCs, IP addresses, and firewalls. Monitor the finer aspects of your network: Hardware monitoring enables CPU, memory, and disk monitoring, for efficient. performance of all devices. Perform seamless faults and alerts management with real-time notifications and detailed logs for quick issue detection and resolution. Achieve network automation, with workflows enabling automated diagnostics and troubleshooting actions. Advanced network visualization-including business views, topology maps, heat maps, and customizable dashboards give admins an at-a-glance view of network status. 250+ pre-built reports covering metrics like device performance, network usage, uptime, facilitate capacity planning and improved decision-making.

Paessler PRTG is an all-inclusive monitoring software solution developed by Paessler. Equipped with an easy-to-use, intuitive interface with a cutting-edge monitoring engine, PRTG optimizes connections and workloads as well as reduces operational costs by avoiding outages while saving time and controlling service level agreements (SLAs). The solution is packed with specialized monitoring features that include flexible alerting, cluster failover solution, distributed monitoring, in-depth reporting, maps and dashboards, and more. PRTG monitors your entire IT infrastructure. All important technologies are supported: • SNMP: ready-to-use and custom options • WMI and Windows Performance Counters • SSH: for Linux/Unix and macOS systems • Traffic analysis using flow protocols or packet sniffing • HTTP requests • REST APIs returning XML or JSON • Ping, SQL, and many more

Obkio is a network monitoring software, observability and diagnostics platform that gives IT teams, MSPs, and network engineers full visibility into network performance, from the office to the cloud. As a leading Network Performance Monitoring (NPM) tool, Obkio deploys lightweight monitoring agents at any location to continuously track latency, jitter, packet loss, and bandwidth, and run Visual Traceroutes across the entire network path. Obkio supports SD-WAN, MPLS, VoIP/UC, and multi-site network monitoring, plus application performance monitoring (APM) with HTTP, Web, and Teams tests. With Obkio Insight, diagnostics are automated, helping teams pinpoint whether issues originate in-house, with an ISP, or a third-party service, and hold providers accountable with real data. Fast to deploy with no hardware required, Obkio turns network data into clear diagnostics and insights. Helping teams reduce downtime, validate SLAs, and prove the performance they're paying for.

​Open-AudIT is a powerful network discovery and inventory software that intelligently scans an organization’s network and stores the configurations of the discovered devices. This provides immediate access to software licensing, configuration changes, non-authorized devices, capacity utilization, and hardware warranty status reports. Open-AudIT can collect significant amounts of data from large and varying networks that are cataloged and can easily be configured into meaningful reports. It enables users to easily create network discovery profiles for their organization and then run a discovery with a single click or even on an automated schedule. It audits the organization’s network daily without impacting the user experience and intelligently stores the configuration of every discovered component. Open-AudIT tracks and reports on IT asset configuration changes, software licensing, shadow IT, and hardware warranty status.

The Nmap project tries to defy the stereotype of some open source software being poorly documented by providing a comprehensive set of documentation for installing and using Nmap. This page links to official Insecure.Org documentation and generous contributions from other parties. Nmap Network Scanning is the official guide to the Nmap Security Scanner, a free and open-source utility used by millions of people for network discovery, administration, and security auditing. From explaining port scanning basics for novices to detailing low-level packet crafting methods used by advanced hackers, this book suits all levels of security and networking professionals. A 42-page reference guide documents every Nmap feature and option, while the rest of the book demonstrates how to apply those features to quickly solve real-world tasks. Examples and diagrams show actual communication on the wire.

Enable your staff to monitor and manage the security, performance, and administration of your entire IT infrastructure from a single platform—all at no cost to you. The comprehensive and powerful ITarian platform helps you simplify operations, boost productivity, and better utilize IT resources. Provide IT staff with more monitoring and management capabilities. Boost IT productivity with integration between roles, functions, and toolsets. Maximize uptime with proactive detection and resolution capabilities. Automate day-to-day tasks with custom scripts.

Network Analyzer provides an in-depth look at all network traffic sources and potential security threats allowing system admins to quickly gather high-level information regarding the health of the network as well as highly granular data for complete and thorough network analysis. Network Analyzer provides a central view of your network traffic and bandwidth data as well as potential network compromises. The powerful home dashboard provides an at-a-glance view of critical netflow or sflow data sources, server system metrics, and abnormal network behavior for quick assessment of network health. Users can easily drill down to see specific information on individual IPs, source port, destination port, or any combination thereof. Network Analyzer’s advanced alerting and reporting capabilities provide IT staff with superior awareness of their network. Highly granular, down-to-the-packet data can be accessed and archived for further tracking and analysis.

Identify all of your assets and map your networks through fast, safe, credential-less scans from a single light agent, with no server install required. Uncover policy violations, visualize IP allocations, identify compliance issues, highlight misconfigurations, and discover security exposures. Leverage recurring scans to track asset changes, identify new assets, and flag offline assets, with built-in alerting. Import, export, script, schedule, integrate, merge, and sync your asset inventory with existing systems. Rumble is fast and identifies assets without the need for credentials or special access. A single agent can assess an entire enterprise, or multiple agents can be used to limit cross-site traffic. Discover networks, large or small, in a fraction of the time required by legacy tools.

Cisco ThousandEyes is a cutting-edge network intelligence platform designed to provide organizations with deep visibility into digital experiences across the internet, cloud, and enterprise networks. By leveraging advanced monitoring and analytics, ThousandEyes helps businesses pinpoint, troubleshoot, and resolve performance issues impacting critical applications, websites, and services. Its comprehensive suite of tools offers insights into network performance, application delivery, and user interactions, enabling organizations to ensure seamless connectivity and optimal user experiences. Widely adopted by Fortune 500 companies and SaaS providers, ThousandEyes is a trusted solution for navigating the complexities of modern hybrid and multi-cloud environments, empowering IT teams to proactively manage and optimize their digital ecosystems.

Icinga is a monitoring system which checks the availability of your network resources, notifies users of outages, and generates performance data for reporting. Scalable and extensible, Icinga can monitor large, complex environments across multiple locations. Icinga 2 is the monitoring server and requires Icinga Web 2 on top in your Icinga Stack. The configuration can be easily managed with either the Icinga Director, config management tools or plain text within the Icinga DSL. Find answers, take actions and become a problem-solver. Be flexible and take your own ways. Stay curious, stay passionate, stay in the loop. Tackle your monitoring challenge. The Icinga stack spans six core strengths that cover all aspects of monitoring. Level up with valuable insights and on-time notifications, eye-opening visuals and analytics. Icinga easily integrates within your systems, and gives you the power to automate your tasks.