NetHogs is a small 'net top' tool. Instead of breaking the traffic down per protocol or per subnet, like most tools do, it groups bandwidth by process. NetHogs does not rely on a special kernel module to be loaded. If there's suddenly a lot of network traffic, you can fire up NetHogs and immediately see which PID is causing this. This makes it easy to indentify programs that have gone wild and are suddenly taking up your bandwidth.

Since NetHogs heavily relies on /proc, it currently runs on Linux only.

 Now supported:

Ideas/ToDo for new releases:

Microsoft's Network Monitor is a tools that allow capturing and protocol analysis of network traffic. Network Monitor 3 is a protocol analyzer. It enables you to capture, to view, and to analyze network data. You can use it to help troubleshoot problems with applications on the network. This article contains download and support information, installation notes, and general usage information about Network Monitor 3. Network Monitor 3.4 is the latest version.

Network Monitor 3 is a complete overhaul of the earlier Network Monitor 2.x version. Some key features of Network Monitor 3 include the following:

tcpxtract is a tool for extracting files from network traffic based on file signatures. Extracting files based on file type headers and footers (sometimes called "carving") is an age old data recovery technique. Tools like Foremost employ this technique to recover files from arbitrary data streams. Tcpxtract uses this technique specifically for the application of intercepting files transmitted across a network. Other tools that fill a similar need are driftnet and EtherPEG. driftnet and EtherPEG are tools for monitoring and extracting graphic files on a network and is commonly used by network administrators to police the internet activity of their users. The major limitations of driftnet and EtherPEG is that they only support three filetypes with no easy way of adding more. The search technique they use is also not scalable and does not search across packet boundries. tcpxtract features the following:

Supports 26 popular file formats out-of-the-box. New formats can be added by simply editing its config file.