1. PDFedit 

http://pdfedit.cz

PDFedit is a free PDF editing tool that works on Windows operating system. You can download it freely from its official site for life-time use. The freeware based on the Qt 3 toolkit and scripting engine (QSA), so it means that every PDF manipulation is scriptable. However, the free PDFedit cannot help you edit password-protected or encrypted PDF documents.

2. PDFescape 

http://www.pdfescape.com

PDF Escape is another free-of-charge PDF editing program. There is no need to download or install this free PDF editor as it supports free online PDF manipulation. After you opened its website, please click EDIT YOUR PDF NOW button, then you can do the following editing: insert text, links or shapes to PDF, delete page and arrange page sequence, edit PDF content and more. Users only need to register a free account to use it forever.

3. PDFfill 

http://www.pdfill.com/pdf_tools_free.html

Freeware PDFfill offers a wide array of PDF manipulation functionalities, covering merge PDF files, crop or rotate PDF pages, embed watermarks, reformat PDF document, split or reorder PDF pages etc. One more note is that the downloaded free PDFfill tools have been bundled with PDFfill PDF Editor which is not free of charge.

4. Cute PDF 

https://editor.cutepdf.com/edit.asp

It is a free online PDF editor that supports various PDF edits, including add password for important PDF file, combine PDFs, adjust page sequence, extract PDF pages, rotate or remove PDF pages, crop or resize page etc. Only need to open an existing PDF files from your local driver, then you can start editing work with the pages tools.

Other Free PDF tools 

http://www.kvisoft.com

Free standalone PDF merger, splitter, PDF to image converter and PDF to HTML converter has been provided with useful functions, designed for Windows operating system. With these free PDF tools, you can easily split password-protected PDF files, merge multiple PDF files into one, add information for PDF, remove unwanted pages, turn PDF to JPG, BNP etc, create HTML webpage from existing PDF and etc.

If you thought PDF is not interactive enough for your online catalog presentation, you can download to try Kvisoft PDF Page Flip Software to generate three dimensional page turning ebooks from any PDF: http://www.kvisoft.com/flipbook-maker/