Free PDF creation and editing tools

More and more I use PDF (Adobe Portable Document Format) to print documents to disk and to send to others. PDF are small, clean (no viruses) and openable by anyone. PDFs provide a clear, well laid-out and somewhat protected way to distribute information and graphics. Here are some free tools to create and edit PDFs:

• Upload your PDF to the site and rearrange pages, combine files, delete pages. Online application, so usable by Windows, Mac or Linux. Handy if you don't have a version of Adobe: PDFHammer: http://www.pdfhammer.com/
  
• And if you are in Windows and you need to generate a PDF, you can do so with other free PDF utilities here http://www.angusj.com/pdftkb/
• Here is an article about the advantages of sending documents as PDF instead of Word:
  http://tinyurl.com/4mf9xn