Phar-GUI is a wxPHP-based graphical frontend for Phar packages; PHPs universal ZIP/TAR files. It can inspect archives, create or extract them, add or remove files, browse the contained code. It also works on meta attributes, the stub or set an alias. It can't yet modify the compression modes.
pax (portable archive exchange) is a standard Unix archiving utility as outlined by POSIX.1-2001 / IEEE 1003.2, to bridge and provide a more universal command line interface. The MirCPIO / paxmirabilis implementation was based on paxtar and is developed by the MirBSD project. It provides -r read and -w write support for cpio, ustar, sv4cpio, ar(5), and the old BSD tar format. paxcpio and paxtar are included for easier transition.