WildPackets OmniPeek Personal

" ...
OmniPeek Personal, the first commercially developed Expert network analyzer available free for personal use. OmniPeek Personal gives individual users the chance to experience the power and extensibility of WildPackets’ award-winning network analysis technology at no cost.

OmniPeek Personal offers:

* Best-in-class wired and wireless analysis in one application
* Intuitive real-time graphics and display with award-winning UI
* Powerful Visual Expert and Packet Visualizer toolsets
* Application analysis and Apdex scoring that reflects end user satisfaction with applications
* Plug-in extensibility

... "

OmniPeek provides more network analysis features and can be used as an alternative for WireShark/Ethereal.