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Free and open source.

Free and open source. The foundation is funded by sponsors, training and certification.

• Reconstructs full TCP streams into files
• Works on live capture or saved pcap files

• Dissectors for hundreds of protocols, so the packet contents are readable rather than hex
• Display filters that cut a huge capture down to one conversation

• Command-line only
• Usually built from source

• Capturing on most systems needs elevated privileges or a driver such as Npcap
• The interface assumes you already know roughly what you are looking for

• Official website
• Full listing and sources

Checked October 1, 2026

• Official website
• Full listing and sources

Checked September 20, 2026