Yes that is right, you cannot buy this stuff because like the air you breath and the words you use to communicate this software is free.
If you are using Microsoft Windows your essential collection of best quality software should include: Mozilla a replacement for Microsoft Internet Explorer and Outlook Express, OpenOffice.org a replacement for Microsoft Office, 7-Zip a free Zip compression utility, and the PDFCreator a replacement for Adobe Acrobat. All of these programs and some other great software packages are available on one easy to use cd.
TheOpenCD.org looks like this, and is easy to download and burn yourself. Each of these program is worthy of it's own story. Now just follow the link.