MRTG is described as '(or Multi Router Traffic Grapher) is an open-source network monitoring tool' and is a Network Monitor in the network & admin category. There are seven alternatives to MRTG for a variety of platforms, including Linux, Online / Web-based, Self-Hosted solutions, BSD and Windows. The best alternative is Zabbix, which is both free and Open Source. Other great apps like MRTG are Netdata, Nagios, LibreNMS and PRTG Network Monitor.
MRTG is mainly a Network Monitor but alternatives to it may also be Website Monitors. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of MRTG.
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