trafshow is described as 'TrafShow continuously display the information regarding packet traffic on the configured network interface that match the boolean expression. It periodically sorts and updates this information' and is a Network Monitor in the network & admin category. There are six alternatives to trafshow for Linux, BSD, Mac, Windows and Oracle Solaris. The best trafshow alternative is Munin, which is both free and Open Source. Other great apps like trafshow are ntop, nload, wavemon and vnStat.
Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.
NTop is a hybrid layer 2 / layer 3 network monitor, that is by default it uses the layer 2 Media Access Control (MAC) addresses AND the layer 3 tcp/ip addresses. ntop is capable of associating the two, so that ip and non-ip traffic (e.g.
nload is a console application which monitors network traffic and bandwidth usage in real time. It visualizes the in- and outgoing traffic using two graphs and provides additional info like total amount of transfered data and min/max network usage.
wavemon is a wireless device monitoring application that allows you to watch signal and noise levels, packet statistics, device configuration and network parameters of your wireless network hardware. It should work (though with varying features) with all devices supported by the...
vnStat is a console-based network traffic monitor for Linux and BSD that keeps a log of network traffic for the selected interface(s). It uses the network interface statistics provided by the kernel as information source.
darkstat is a packet sniffer which runs as a background process, captures network traffic, calculates statistics and serves them to a web browser.
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Munin does not show level 3+ network info. It primarily shows application / server level info, with very little network info. trafshow is purely a higher-layer network info tool.