FreeNATS is a PHP and MySQL based automatic network status testing, alerting and reporting package.
FreeNATS allows you to test your network and generate reporting to give you a bird’s eye view of what is happening in your organisation.
The software is intended to be a lightweight alternative to other (far superior but more complex) systems. If you are looking for an “enterprise-level solution” then FreeNATS is probably not for you and something like Nagios which is also free and open source may be a better option.
The system can be configured to evaluate test results against user defined values to determine the result (you can set the time after which a web test is deemed to be a warning or a failure) and have events (optionally including alerts being closed when a service is restored) notified to you by email in a variety of formats (including email to SMS compatible).
Key Features
- Supports the following server-side test methods:
- ICMP (Ping).
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- Web Request (Time or Size).
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- SMTP, IMAP and POP3 (Time to Open).
-
- MySQL (Time, Rows or Data).
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- TCP and UDP Connection (Open Port).
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- DNS Query (simple query or direct server lookup).
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- SMB (Windows share) Connection Time.
- Email Alerting.
- URL Alerting.
- Test Schedules.
- Publishable Views.
- Availability Reports.
- Graph & Table History.
- Live Monitor.
Website: www.purplepixie.org/freenats
Support: Documentation
Developer: PurplePixie Systems
License: GNU General Public License v3.0

FreeNATS is written in PHP. Learn PHP with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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