Twin directories of viewers:

[DIR]  ftp://ftp.uni-leipzig.de/pub/kommunikation/infosysteme/pc/win95/viewers/
[DIR]  ftp://ftp.uni-leipzig.de/pub/kommunikation/infosysteme/pc/viewers/
[DIR]  ftp://ftp.uni-leipzig.de/pub/linux/pub/comp/os/linux/sunsite/X11/xapps/graphics/viewers/
[DIR]  ftp://ftp.uni-leipzig.de/pub/linux/pub/comp/os/linux/sunsite/apps/graphics/viewers/
[DIR]  ftp://ftp.dit.upm.es/pub/msdos/winsock/hgopher/viewers/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/apps/graphics/viewers/
[DIR]  ftp://ftp.farlep.net/pub/Linux/graphics/viewers/
[DIR]  ftp://ftp.farlep.net/pub/linux/graphics/viewers/
[DIR]  ftp://ftp.mts.net/pub/winsock/apps/mosaic/viewers/
[DIR]  ftp://ftp.heaven.net/pub/windows/viewers/
[DIR]  ftp://ftp.gno.org/pub/apple2/gs.specific/utils/viewers/
[DIR]  ftp://ftp.beos.hu/pub/beos/obsolete/gfx/viewers/
[DIR]  ftp://ftp.kreonet.re.kr/tools/graphics/povray/ezine/viewers/
[DIR]  ftp://ftp.kreonet.re.kr/tools/graphics/povray/viewers/
[DIR]  ftp://ftp.dur.ac.uk/pub/WWW/viewers/
[DIR]  ftp://ftp.msstate.edu/pub/pc/windows/viewers/
[DIR]  ftp://ftp.informatik.uni-oldenburg.de/pub/amiga/EGS/viewers/
[DIR]  ftp://ftp.wu-wien.ac.at/pub/www/NCSA/Mosaic/Windows/v2.1.1/viewers/
[DIR]  ftp://ftp.wu-wien.ac.at/pub/gopher/wingopher/viewers/
[DIR]  ftp://ftp.ncsa.uiuc.edu/Web/Mosaic/Unix/viewers/
[DIR]  ftp://ftp.ncsa.uiuc.edu/Web/Mosaic/Windows/v2.1.1/viewers/
[DIR]  ftp://ftp.uwinnipeg.ca/pub/win3/mosaic/viewers/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/eclipse/tools/ve/downloads/drops/1.4.0/N200907310026/eclipse/plugins/org.eclipse.ve.swt/overrides/org/eclipse/jfa/viewers/
[DIR]  ftp://ftp.ku.lt/pub/Windows/editors/MicrosoftOffice/viewers/
[DIR]  ftp://ftp.mao.kiev.ua/pub/software/Linux/apps/graphics/viewers/
[DIR]  ftp://greyone.tulatelecom.ru/pub/windows/viewers/
[DIR]  ftp://ftp.peak.org/pub/next-ftp/next/apps/graphics/viewers/
[DIR]  ftp://ftp.peak.org/pub/next-ftp/openstep/mach/apps/graphics/viewers/
[DIR]  ftp://ftp.nnov.net/pub/software/win32/viewers/
[DIR]  ftp://ftp.ps.pl/dsk0/www.eclipse.org/eclipse/downloads/documentation/2.0/html/plugins/org.eclipse.platform.doc.isv/reference/api/org/eclipse//viewers/
[DIR]  ftp://ftp.ps.pl/dsk0/synergy.caltech.edu/pub/ggi/programs/viewers/
[DIR]  ftp://ftp.cse.buffalo.edu/mirror3/X11/Eclipse/eclipse/downloads/documentation/2.0/html/plugins/org.eclipse.platform.doc.isv/reference/api/org/eclipse/j/viewers/
pkg://InventorXt-devel-2.1.5-26.fc5.x86_64.rpm:103622/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-26.fc5.x86_64.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-26.fc7.x86_64.rpm:103940/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-26.fc7.x86_64.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-29.fc6.1.i386.rpm:103607/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-29.fc6.1.i386.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-29.fc6.1.ppc.rpm:103527/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-29.fc6.1.ppc.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-29.fc7.1.i386.rpm:103568/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-29.fc7.1.i386.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-29.fc7.1.ppc.rpm:103481/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-29.fc7.1.ppc.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-29.fc7.1.x86_64.rpm:103545/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-29.fc7.1.x86_64.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-30.fc8.1.i386.rpm:103654/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-30.fc8.1.i386.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-30.fc8.1.ppc64.rpm:103626/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-30.fc8.1.ppc64.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-30.fc8.1.x86_64.rpm:103650/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-30.fc8.1.x86_64.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-30.fc8.i386.rpm:103502/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-30.fc8.i386.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-30.fc8.ppc.rpm:103419/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-30.fc8.ppc.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-30.fc8.ppc64.rpm:103451/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-30.fc8.ppc64.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-30.fc8.x86_64.rpm:103457/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-30.fc8.x86_64.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-31.fc9.i386.rpm:103740/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-31.fc9.i386.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-31.fc9.ppc64.rpm:103704/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-31.fc9.ppc64.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-33.fc10.i386.rpm:103958/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-33.fc10.i386.rpm/usr/include/Inventor/Xt/viewers/
pkg://InventorXt-devel-2.1.5-33.fc10.x86_64.rpm:103929/usr/include/Inventor/Xt/  info  downloads[DIR]3  InventorXt-devel-2.1.5-33.fc10.x86_64.rpm/usr/include/Inventor/Xt/viewers/