Wireshark & Tshark
Wireshark is the premier tool for analyzing PCAP, PCAP-NG, and other files.
It is available for all platforms - Linux, macOS, and Windows. It is free, and open source.
Wireshark can open the pcap file generated by the WiFi Coconut, or you can export live packets to the Wireshark command line companion, Tshark to view it live in the console.
sudo wifi_coconut --no-display --pcap=- | tshark -r -