The freely available PostScript interpreter is GhostScript. Coupled with the viewer GhostView, it allows one to view PostScript on Unix/X-windows, PC/Windows, and Macintosh.
The home page for Ghostscript and Ghostview is at http://www.cs.wisc.edu/~ghost. The ftp site is ftp://ftp.cs.wisc.edu/. Ghostscript is also a good way to bitmap PostScript, which is occasionally useful for authors with very large Postscript figures.
Some NeXTstep users complain that they cannot view papers on the screen. NeXTstep users should obtain the outline fonts and install them in the Fonts directory. This should correct the problem.
The TeX system used by the archive is based on the teTeX distribution, which is a freely available, high-quality distribution of TeX/LaTeX for Unix-compatible systems.
Lots of TeX information is available on the Web from the TeX User Group
Access to a worldwide TeX repository is available at your local CTAN mirror site.
AMS fonts can be found at ftp://e-math.ams.org/.
See http://xxx.lanl.gov/hypertex/ for HyperTeX utilities and Hyperdvi previewers.
If you want to learn more about compression, you can check the Usenet newsgroup alt.comp.compression FAQ.
Obtain these tools for your platform as follows.
Unix comes with everything but gzip (although some like GNU/Linux, or NeXTSTEP 3.2/3.3 come with that as well). For more information on how to get gzip, see the GNU web page on How to get GNU Software at http://www.gnu.ai.mit.edu/software/software.html. We also provide a csh script called uufiles.
Version of these tools for VMS can be found at ftp://xxx.lanl.gov/software/vmstools. Check the uufiles information as well.
Versions of these tools for Macintosh can be found at http://wuarchive.wustl.edu/systems/mac/info-mac/comm/_Utilities/_Compress_&_Translate/. For information on Mac Gzip, see the Mac Gzip Homepage at http://persephone.cps.unizar.es/general/gente/spd/gzip/. There is now a Mac version of uufiles available at ftp://xxx.lanl.gov/software/mac-tools/. In order to use this, you will also need a newer version of TCL for the Mac.