doPDF is a free PDF converter for both personal and commercial use. Using doPDF you can create searchable PDF files by selecting the “Print” command from virtually any application.

LibreOffice is the free power-packed Open Source personal productivity suite for Windows, Macintosh and Linux, that gives you six feature-rich applications for all your document production and data processing needs: Writer, Calc, Impress, Draw, Math and Base.

DocFetcher is a desktop search application: It allows you to search the contents of documents on your computer. – You can think of it as Google for your local document repository.

Multi Commander is a multi-tabbed file manager that is an alternative to the standard Windows Explorer. It uses the very popular and efficient dual-panel layout.