Webshark is a tool for visualizing pcap (e.g. Wireshark) network captures on a timeline. It was written as part of reverse-engineering efforts because the tabular view in Wireshark didn't visualize the timing aspects of the packets very well.
Webshark displays every pair of two IPs as a separate row; for this reason you'll only want to load relatively small/well-filered packet captures into Webshark. I recommend setting up a network where only the devices you are interested in are connected, and capturing that.
For now, Webshark supports only the classic pcap format (since it's so easy to parse); captures in the newer pcapng format can be converted:
$ editcap foo.pcapng foo.pcap
Screenshot
