PRTG Network Monitor is the powerful and comprehensive network monitoring solution from Paessler AG. It monitors your network using a whole range of technologies and assures the availability of network components and measures traffic and usage. PRTG saves costs by avoiding outages, optimizing connections, saving time and controlling service level agreements (SLAs).
Network monitoring helps you keep your business healthy:
•Avoid expensive outages
•Address bottlenecks before they cause problems
•Reduce costs by buying only the hardware you need
PRTG Network Monitor runs on a Windows machine within your network, collecting various statistics from the machines, software, and devices which you designate. It also retains the data so you can see historical performance, helping you react to changes. PRTG comes with an easy-to-use web interface with point-and-click configuration. You can easily share data from it with non-technical colleagues and customers, including via live graphs and custom reports. This will let you plan for network expansion, see what applications are using most of your connection, and make sure that no one is hogging the entire network just to torrent videos.
PRTG can collect data for almost anything of interest on your network.  It supports multiple protocols for collecting this data:
•Packet Sniffing
•NetFlow, jFlow, and sFlow

SmartPhone Apps for PRTG is the smartPhone applications for mobile network monitoring. The apps make it possible to monitor your network while on the go. If you are using the PRTG network monitoring software from Paessler, all you need is an iPhone, iPad, iPod Touch, or an Android phone or tablet. With the according app you can check your network performance from anywhere.

Webserver Stress Tool: Performance, Load, and Stress-Test for Web Servers. By simulating the HTTP requests generated by up to 10.000 simultaneous users, you can test your web server performance under normal and under excessive loads to ensure that critical information and services are available at speeds your end-users expect. This software is quick to set up, it is easy to use and can create enormous loads for web servers.
We have successfully tested Webserver Stress Tool 7 with
•more than ~500 MBit/s network load
•more than 1,000.000 pageviews per hour and
•up to 10,000 simultaneous users
Webserver Stress Tool supports a number of different testing types: Performance Tests, Load Tests, Stress Tests, Ramp Tests and Various other tests.