TraceWrangler is a network capture file toolkit running on Windows (or on Linux, using WINE) that supports PCAP as well as the new PCAPng file format, which is now the standard file format used by Wireshark. The most prominent use case for TraceWrangler is the easy sanitization and anonymization of PCAP and PCAPng files (sometimes called "trace files", "capture files" or "packet captures"), removing or replacing sensitive data while being easy to use.
utility to read, write and modifiy PCAPng files
Sanitization/Anonymization/Scrubbing of packet captures created by Wireshark/TCPDump/etc.
Editing packets in batch, especially by removing certain protocol layers like MPLS, GRE or GTP-u, or to convert Linux cooked captures to Pseudo-Ethernet
Merging capture files, especially PCAPng files with more than one interface and using filters to keep only certain frames
Gathering and aggregating packet details about a large number of capture files, like IP, TCP and UDP conversations
Displaying the PCAPng specific block structure of a file
extracting conversations from multiple files to new capture files, based on manual filters, capture file indicator frames, or Snort alerts