Desktop

LibreOffice

http://www.libreoffice.org/

Free and open-source alternative to Microsoft Office, composed of Writer (equivalent to Word), Calc (equivalent to Excel), Impress (equivalent to PowerPoint). This suite can read and edit files created with Microsoft Office. It has a PDF export feature.

Sumatra PDF

http://blog.kowalczyk.info/software/sumatrapdf/free-pdf-reader.html

Light PDF reader. It is an alternative to Acrobat Reader.

PDF Creator

http://www.pdfforge.org/pdfcreator

Creates a virtual printer to convert a document to PDF via printing.

Grisbi

http://www.grisbi.org/

Personal accounting software.

GCstar

http://wiki.gcstar.org/en/install_windows

Collections management software (books, CDs, DVDs, etc). Has a feature to import information from specialized websites. Manages loans.