Evince - Simply a Document Viewer
- A document viewer for GNOME; currently supports pdf, postscript, djvu, tiff and dvi formats. Latest stable release is 2.30.3, 2010-06-25.
Ghostscript, Ghostview and GSview Homepage
- An interpreter for the PostScript language and PDF along with related software and documentation. Latest release is 3.64, 2009-02-03.
KPDF
- A pdf viewer based on xpdf for KDE. The latest stable version is 0.5.10, 2007-02-19 as part of KDE 3.5.9. N.B.: Okular for KDE 4 is the successor to KPDF.
Okular
- A universal document viewer based on KPDF for KDE 4. Latest stable release is 0.11, 2010-08-10. This is the successor to KPDF (for KDE 3).
PDFedit
- A free/open source editor for manipulating PDF documents. Comes with both a GUI and a command-line interface. Also available in Czech, French, Russian, and Spanish. Latest release is 0.4.3, 2009-07-21.
Txt2pdf - convert text files to Acrobat PDF
- A tool to convert txt, text, textual report, spool into pdf; support for English, Japanese, Chinese (simplified and traditional), Korean, Greek, Polish, Hebrew, Thai languages.