I want to make one PDF file by merging two or more PDF files. Which software is best for this work?
You can do it here, online, for free: http://www.pdfmerge.com/
Another nice free solution would be this software: http://sourceforge.net/projects/pdfsam/files/pdfsam/2.2.1/pdfsam-win-v2_2_1.exe/download
Another online tool for free... http://fusionpdf.com