Silicon Graphics can tell you about their own and third-party
  commercial software.  Call SGI Direct for more information (see the
  misc FAQ for phone numbers) or look around on SGI's WWW server,
  Silicon Surf (http://www.sgi.com/ or its mirrors; see the misc FAQ),
  particularly under "Surf Shop" and "Subsidiaries and Partners".

  The best general reference for finding sources on the Internet is
  Jonathan Kamens' "Finding Sources" document. It can be FTPed from
  ftp://rtfm.mit.edu/pub/usenet/news.answers/. Read it
  carefully before you post a question about finding software ...
  because half of your answers will be "look in Archie" anyway, and
  "Finding Sources" tells you how to do that.

  Useful general archive sites include ftp://ftp.x.org/ for X software
  (particularly in the /contrib and /R5contrib directories) and X itself
  (in /pub), ftp://prep.ai.mit.edu/pub/gnu/ for GNU software, and
  ftp://ftp.uu.net/ and ftp://wuarchive.wustl.edu/ for nearly anything,
  including archives of many Usenet sources newsgroups and mirrors of
  the aforementioned GNU and X archives.

  The best SGI-specific reference is Bill Henderson's
  <billh@hampton.sgi.com> SGI anonymous FTP list. (Look in the misc FAQ
  under "WWW pages" and "network-accessible documents".)  Good places to
  look, if you just feel like looking, are ftp://ftp.sgi.com/ and
  ftp://sgigate.sgi.com/, where are kept any number of freebies from the
  folks at SGI, http://www.sgi.com/Fun/free/, a collection of freeware
  from SGI and elsewhere, and ftp://swedishchef.lerc.nasa.gov/, a site
  particularly well-stocked with SGI-related materials.

  SGI publishes a freeware CD-ROM with sources and binaries for popular
  free software; it is included with new systems and its most recent
  versions are available on the web at http://freeware.sgi.com/ which  
  is updated frequently.

  Finally, see the next question for places to find precompiled
  software and questions (in this and the other SGI FAQs) which discuss
  particular packages for pointers to those packages.