WireShark 0.99.6a

Wireshark is one of the worlds foremost network protocol analyzers, and is the standard in many parts of the industry.
WireShark is a project developed on the base of the one that started in 1998. Hundreds of developers around the world have contributed to it, and it it still under active development.
Main features:
- Standard three-pane packet browser
- Multi-platform: Runs on Windows, Linux, OS X, Solaris, FreeBSD, NetBSD, and many others
- Multi-interface: Along with a standard GUI, Wireshark includes TShark, a text-mode analyzer which is useful for remote capture, analysis, and scripting
- The most powerful display filters in the industry
- VoIP analysis
- Live capture and offline analysis are supported
- Read/write many different capture file formats: tcpdump (libpcap), NAIs Sniffer(compressed and uncompressed), Sniffer Pro, NetXray, Sun snoop and atmsnoop, Shomiti/Finisar Surveyor, AIXs iptrace, Microsofts Network Monitor, Novells LANalyzer, RADCOMs WAN/LAN Analyzer, HP-UX nettl, i4btrace from the ISDN4BSD project, Cisco Secure IDS iplog, the pppd log (pppdump-format), the AG Groups/WildPackets EtherPeek/TokenPeek/AiroPeek, Visual Networks Visual UpTime and many others
- Capture files compressed with gzip can be decompressed on the fly
- Hundreds of protocols are supported, with more being added all the time
- Coloring rules can be applied to the packet list, which eases analysis