The latest version of Scapy, a python-based PCAP packet manipulation tool, has been released on Aug 07.
Scapy enables scanning, fingerprinting, sniffing and packet forging. Scapy required python and runs on pretty much any platform that support python. The documentation is rich and details and covers all the major features.
Check out the installation page for detail about the latest releases and any known bugs.
Download and installation details can be found here.