Any of the programs may be downloaded free of charge. To do this, go to the descriptive page for each program by clicking on its entry on the Contents Page, and find the download link near the bottom of the page. The downloaded file will be a ZIP archive containing the original source code, the current source code, input description (if available), test cases (if available) and any additional descriptive material. The available non-copyrighted references may be downloaded from the reference page associated with each program. Instructions are included for compiling the source code using the free gfortran compiler from the GNU compiler collection.
Some people prefer to have the complete collection of programs, instructions, test cases, references, and executables on external media. I will continue to make a thumbdrive or CD available for a nominal charge of $99 US, postpaid. You may order by mail by sending cash, check or money order to PDAS, 248 Meadow Road, Santa Cruz CA 95061 USA. If you wish to pay by PayPal or credit card, click the button below. You will be directed to the PayPal site where you can enter your payment information safely. If you want the CD instead of the thumbdrive, leave a note on the Paypal page or send an email to firstname.lastname@example.org and I will take care of you.