Wikipedia
Tcptrace
tcptrace is a tool written by Shawn Ostermann at Ohio University, for analysis of TCP dump files. It can take as input the files produced by several popular packet-capture programs, including tcpdump/ WinDump/ Wireshark, snoop, EtherPeek, and Agilent NetMetrix.
tcptrace can produce several different types of output containing information on each connection seen, such as elapsed time, bytes and segments sent and received, retransmissions, round trip times, window advertisements, throughput, and more. It can also produce a number of graphs for further analysis. As of version five, minimal UDP processing has been implemented in addition to the TCP capabilities.
Tcptrace is released under GNU GPL 2+.