Hameedali Mohabilasha
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Network Monitoring tool
HI every one we need Network monitoring tool for free ware
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All the mentioned solutions are free and can be used to monitor networks.
Yes, PRTG is free for up to 100 sensors (very roughly 10 devices). If your environment is bigger than that, you will either need to purchase a commercial license, or look at open-source options. However, as Dan has already said, free doesn't mean you don't pay. Open-source products will require someone on staff that can set up an maintain these products, so you end up "paying" in time/effort.
For an independent comparison of PRTG and Nagios (one of the most popular open-source monitoring tools), check out this article by Funkschau.
If you'd like to give PRTG a try, simply download the free 30-day trial version with unlimited sensors. After the 30 days it will automatically revert to our 100-sensor freeware version.