Published at LXer:
Portable Document Format, designed in the early 1990s by Adobe Systems, is slowly replacing PostScript as the preferred format for saving and viewing generic documents. Early on, only Adobe supplied programs that enabled users to view PDF files. But since the format's specification is open, Adobe Reader (formerly "Adobe Acrobat Reader") is now only one among an increasing set of PDF viewers. Here's a guide to the best alternatives for Linux users.