MRTG

MRTG, which stands short for Multi Router Traffic Grapher, is a specialized third-party software solution that was designed to aid administrators and users alike to keep track of various data transfer events occurring through a router or a similar device.
All the devices that feature support for the SNMP (Simple Network Management Protocol) are capable to be subjected to monitoring through this application. This software solution will also save the output results in an HTML file that will hold various images of the graphical representation of the network traffic that has been recorded.
MRTG can be used to graph a wide variety of network-enabled devices as well as other devices including vending machines or weather data. The application is written in the Perl programming language and works on various operation systems, ranging from Windows and Unix to even Netware systems.
The application comes packed in an archive. It is a portable application that requires no installation, therefore making it possible for you to use it even from removable storage units such as USB flash drives or external HDDs or SSDs. It won't tamper with your registries or generate extra files or folders except the output files it craetes.