16. On-screen previewing of printable things.
Nearly anything you can print can be viewed on the screen, too.
16.1. PostScript
Ghostscript has an X11 driver best used under the management of
the PostScript previewer gv.
The latest versions of these programs should be able to view PDF
files, as well. Note that gv has replaced the older previewer
"Ghostview"; the new user interface is much prettier and featureful
that ghostview's plain old Athena GUI.
16.2. TeX dvi
TeX DeVice Independent files may be previewed under X11 withxdvi. Modern versions of xdvi call ghostscript to
render PostScript specials.
A VT100 driver exists as well. It's called dgvt. Tmview
works with GNU/Linux and svgalib, if that's all you can do.
16.3. Adobe PDF
Adobe's Acrobat Reader is available for GNU/Linux; just download it
from the Adobe web site.
You can also use xpdf, which is free software, and I believegv supports viewing PDF files with gs under X11.
Free eBook: 
