It’s been a while but we’re updating our free offerings on these subjects. First, the design and maintenance documents: evidently the U.S. military learned a few things in Iraq and Afghanistan, these are fairly extensive and they can be found on these two pages:
Some of the documents were combined and consolidated; we still have the previous documents available.
With the software, as opposed to other agencies of the U.S. government, the Federal Aviation Administration continues to update and offer their software for free. You can take a look at what we have to offer at Software and Spreadsheets for Airfield Design.