Adobe Acrobat Reader

Though the vast majority of average users will never need the PDF-creation tools of Adobe Acrobat Professional, just about everyone will want to have Acrobat Reader on hand. Without this freebie, your computer will not be able to decipher documents encoded in Adobe's ubiquitous Portable Document Format. Though this stalwart isn't exactly exciting, it should be a required download for every person who owns a computer. It also has the distinction of being one of the few applications we've enshrined in Download.com's Hall of Fame.