Adobe Acrobat is one of the best pdf software I prefer to use.
1. Adobe Acrobat Reader
It is a freeware. If you have not installed any pdf reader in your computer and searching free pdf reader, you should use adobe acrobat reader. If you want to download it, please click here. (Note: select Operating System, Language and Version to download)
2. Adobe Acrobat Pro
There are so many features in Adobe Acrobat Pro such as editing pdf, combining pdf files, converting pdf files into (word, excel, power point) files, converting any printable documents into pdf file and adding signature, etc., . But it is not freeware. You can use it as free trial. You have to pay license fee after free trial period if you will continue to use. You can uninstall it if you don't want to use it anymore. If you want to download it, please click here.