Adobe reader has been the favorite pdf reader for sometime now. That's mainly because its free! But nowadays there are many free pdf readers which can actually work out better for you.
This is a simple document viewer. It can view multiple document formats like pdf, postscript, djvu, tiff, dvi and many others.
I personally did not like Adobe reader because its a heavy application and it comes with a lot of additional services. Its kind of resource hungry and even adds a browser plug in which was seriously slowing down my browsing speed! Its a bit too much just to read a pdf isn't it?! That's when i decided to look for other pdf readers. There are so many open source free pdf readers which are a lot lighter and better. First i would go through some of the open source pdf readers and later some of the freewares.
Evince
This is a simple document viewer. It can view multiple document formats like pdf, postscript, djvu, tiff, dvi and many others.
It provides search, thumbnail view and page indexing features.This is an open source tool.