PowerPC Mac OS X LibreOffice and Firefox
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2015-10-22 Added info.
If you have old PowerPC Mac, you can install:
LibreOffice for Mac OS X from http://ftp.osuosl.org/pub/manulix/other/libreoffice/
Firefox for Mac OS X from http://www.floodgap.com/software/tenfourfox/
Or install Linux that has Firefox, LibreOffice etc, using Lubuntu 12.04 or Lubuntu 14.04 as dual boot: Ubuntu 12.04 Mac PowerBook G4 PowerPC