There are many open source tools for translators which can provide a very cost effective alternativeas.

Open Office

OpenOffice.org 3 is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages. It can be downloaded and used completely free of charge for any purpose.

Download from: http://www.openoffice.org/

LibreOffice

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. Support and documentation is free from our large, dedicated community of users, contributors and developers.

Download from: http://www.libreoffice.org/

OmegaT

OmegaT is a free translation memory application written in Java. It is a tool intended for professional translators. It does not translate for you! (Software that does this is called "machine translation", and you will have to look elsewhere for it.) New version of OmegaT supports many files formats including Docx, Xliff, Xml and also Google Translate.

http://www.omegat.org/en/omegat.html