pdfsam for Merging and Splitting pdf Files (free)

pdfsam is one of the most useful tools I have been using recently in joining and splitting pdf files. Adobe Reader doesn't do it, and Adobe Acrobat is just too expensive for me. pdfsam is an opensource free alternative to Adobe Acrobat and works like a charm. The website is www.pdfsam.org. You can also support the developer by donating some money as well. Please do so if you can afford it.