Spiceworks!

An uncompromising mature enterprise-level platform designed for real-time monitoring of millions of metrics collected from tens of thousands of servers, virtual machines and network devices, effortlessly scaling to even larger environments.

LibreNMS is an autodiscovering PHP/MySQL based network monitoring system forked from Observium. LibreNMS aims to be easy to use, painless to deploy, and support monitoring of a wide range of devices. Observium's license changed to a modified QPL license in May 2012, and recently was split into free and commercial versions. Our aim with LibreNMS is to continue to create a usable NMS, but with a community focus and GPL licensing.

Datadog is a monitoring service for IT, Dev & Ops teams who write and run applications at scale, and want to turn the massive amounts of data produced by their apps, tools and services into a unified view of IT infrastructure. Datadog's capabilities are provided on a SaaS-based data analytics platform that enables multiple teams to work collaboratively on infrastructure issues.

Icinga is a fork of Nagios and is backward compatible. So, Nagios configurations, plugins and addons can all be used with Icinga. Though Icinga retains all the existing features of its predecessor, it builds on them to add many long awaited patches and features requested by the user community. Icinga is an enterprise grade open source monitoring system which keeps watch over a network and any conceivable network resource, notifies the user of errors and recoveries, and generates performance data for reporting. Scalable and extensible, Icinga can monitor complex, large environments across dispersed locations. Icinga is licensed under GPL V2. »

An advanced, easy-to-use monitoring solution for your entire network. The software's features include: up/downtime monitoring, traffic and usage monitoring, packet sniffing, failover clustering, in-depth analysis and concise reporting. A user-friendly web-based interface allows users to quickly auto-discover and configure the network devices and sensors they wish to monitor. All common methods for acquiring network usage data are supported: SNMP and WMI, Packet Sniffing and NetFlow / sFlow / jFlow. It also offers SMTP/IMAP Roundtrip-Email Monitoring and VMware Monitoring, VoIP Monitoring, Toplists for Packet Sniffing and Netflow Sensors, as well as sensor aggregation using its built-in Sensor Factory. PRTG Network Monitor includes more than 200 sensor types for all common network services (e.g. PING, HTTP, SMTP, POP3, FTP, SSH etc.), allowing users to monitor networks for availability, speed and failures. As soon as an outage occurs, alerts are sent via email, SMS, pager messages and other means. Request times and downtimes are recorded in an internal database, making it easy to compile performance, downtime and SLA reports. Monitoring, reporting and notifications can be automatically scheduled at specific times. High Availabiltiy is guaranteed by the innovative failover cluster, and remote probes can be used for easy multi-location monitoring. Network maps can be created which provide users with a unique visual network management tool. PRTG Network Monitor's Freeware Edition is completely free for personal and commercial use. The Commercial Editions are required if you want to monitor more than ten sensors. »

WinAudit is an inventory utility for Windows computers. It creates a comprehensive report on a machine's configuration, hardware and software. WinAudit is free, open source and can be used or distributed by anyone. IT experts in academia, government, industry as well as security conscious professionals in the armed services, defence contractors, electricity generators and police forces use WinAudit.

OTRS ITSM is a fundamental solution for IT Service Management organizations. Based on ITIL best practices, it provides management tools for request and incident management, problem management, change management and release management.

The Belarc Advisor builds a detailed profile of your installed software and hardware, network inventory, missing Microsoft hotfixes, anti-virus status, security benchmarks, and displays the results in your Web browser. All of your PC profile information is kept private on your PC and is not sent to any web server.

Observium is an autodiscovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems including Cisco, Linux, FreeBSD, Juniper, Brocade, Foundry, HP and many more.

Cabot is a free, open-source, self-hosted infrastructure monitoring platform that provides some of the best features of PagerDuty, Server Density, Pingdom and Nagios without their cost and complexity.

IT Asset Tool is a powerful free software to inventor and monitor your network. This easy approach allows to operate without installation in a short time. With an essential interface, IT Asset Tool inventors all Windows Hosts including their Software and Hardware features. An efficent engine of reporting allows to generate a large number of analyses.

Lansweeper is an agentless Asset Management solution that can scan any network setup. Use IP ranges, set up AD integrated scanning, specify crucial servers to be scanned more regularly … Get a complete inventory of all workstations, servers, routers, switches, monitors, printers, VoIP phones …

IT Asset Management Software. Powerful, comprehensive and feature rich control of IT infrastructure via a modern and intuitive web-based interface. Key features include agent and agent-less automated inventory, network discovery, remote desktop control, software deployment and metering, license management and financial tracking. Count on reliable, precise and updated information about your software and hardware assets to maximize ROI and decrease TCO. Enjoy rapid, autonomous, hassle free implementation; typically in less than four hours! »