NetGraph is a good, free software only available for Windows, belonging to the category Networking software with subcategory Analysis (more specifically Bandwidth Monitors).

More about NetGraph

NetGraph is a not that heavy software that doesn't take up as much storage space than many software in the category Networking software. It's a program very heavily used in Bangladesh, Qatar, and Pakistan.Since the software was added to our catalog in 2005, it has managed to achieve 15,580 downloads, and last week it achieved 5 downloads.The program version is 2.0.4.23 and was updated on 12/21/2006. It's available for users with the operating system Windows 98 and previous versions, and you can get it only in English.