Free alternative to Microsoft office
Open Office.org (or OOo for short) is a direct replacement for Microsoft’s Office suite (excluding Outlook). It is a very mature project and they have very recently released version 3.1.0. You can use replacements for Word, Excel, PowerPoint and Access. OOo can also read and write in any of the native file formats, as well as a few others (like PDF) which older versions of Office can’t. Being a Linux man myself in a predominantly Windows environment, I find OOo a life saver. This one comes highly recommended.