A java wrapper for popular "libpcap" and "WinPcap" libraries. Accurate full API translation. Packet buffers delivered with no copies. Send custom packets, gather statistics. Comprehensive and easily extensible DPI engine.
How Fast Is Your Network Today? Soap-Stone is the Java network benchmark which can answer this question for a range of protocols (raw, http, rmi, soap) and other dimensions.
pyip is a Python package offering assembling/disassembling of raw ip packet, including ip, udp, and icmp. Also it includes 2 utilities based on raw ip, traceroute and ping.
Java Netflow Collect/Analyzer uses pure Java to collect netflow v1 v5 v7 v8 v9 UDP packets from cisco routers. It stores both raw data or analyzed contents to DB thru JDBC and can be used in large enterprises or ISPs. JNC beta is ready JNA is underway.
Tattoo will provide a set of command-line scripts for analyzing raw tcpdump files or ASCII hexadecimal representations of network traffic to identify format, function, and communication model.