Vita Tools allows you to unpack the contents of a PUP file for the Vita. From there,
the unpacked files can be used for whichever reason or
unpacked even farther using tools such as PKGView.

In the v1.04 update, deroad has added 'readself' which
shows information about the Vita's Signed Executable and Linkable Format (SELF).

Download: https://github.com/wargio/vitatool/zipball/master