The 1.9.0 version of Libpcap for Mac is provided as a free download on our software library. This Mac download was scanned by our built-in antivirus and was rated as clean. The size of the latest setup package available for download is 813 KB. The actual developer of this free software for Mac is The Tcpdump Group. The program lies within Internet & Network Tools, more precisely Network tools.
From the developer:
Libpcap is a free and open-source library for network monitoring. The tool offers a system-independent interface for user-level packet capture. The applications include security monitoring, network debugging, network statistics collection, etc. The program provides a portable framework for low-level network monitoring.
You may want to check out more Mac applications, such as tnv or Wireshark, which might be similar to Libpcap.