What you are shipping, how far it is going, who you are using for freight, etc. will dictate the type of crating you will need for LTL.
I don't know of a software that does this for you, there are too many variables and once you know the variables, you can just build what is needed instead of being told what to build.
Flat Panels,
* lay on a skid slightly bigger than the panels, place cushion between each panel, use Poly Strapping around the panels only, put a sacrifice sheet on top, use more Poly Strapping around the entire skid.
* would suggest putting a DO NOT STACK cone on the top.
Custom / delicate.
* figure out the overall size of the item and build a full-on shipping crate with enough buffer and strong enough to survive the handling.
* wood is cheap and a LOT easier to overbuild than file a freight damage claim.
Example
https://www.instructables.com/id/Need-to-ship-something-safely-How-to-build-a-custo/