Since his PS Vita work, PlayStation 4 developer LMAN (aka TheLeecherMan) released PS4PKGViewer which is a PS4 Package (PKG) Viewer with a few revisions and details below!
To quote from TheLeecherMan’s Blog on this latest PS4PKGViewer release:
PS4PKGViewer By LMAN © 2018
A Small Tool to View PS4 Package Info.
- Improved speed when processing package.
- Added support to export unencrypted contents.
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Also of note, a PlayStation 4 PARAM.SFO Editor is in the works from xDPx for those interested: