I wrote a simple ruby tool to create .pack files.
It would probably be most useful if I integrated it with db packer/unpacker.

Usage is (boot/main/patch/mod/movies is pack type):
jruby build_pack out.pack mod directory
Where directory contains all files and subdirectories to add (directory/db/blah/blah etc.)

It's in the same directory on etwng as Python .pack unpacker (which has problems on 64-bit systems,
for 's sake why is so much software broken on 64-bit systems ... I'll need to rewrite it in Ruby someday)