One of the most important apps for any user is the office suite. The most popular suite is, of course, Microsoft Office. It’s an excellent application, with lots of wizards and templates to make tasks easier, and more features than any one person could ever need. It also costs a few hundred dollars, and they keep changing their file format every few releases just to remind everyone they have to upgrade to the newest version or risk not being able to read others’ documents.
Another excellent office suite is OpenOffice. It is also has lots of wizards and templates, and more features than any one person could ever need. It is available for free, however. And while it has its own file format, it can also read and save Microsoft Office documents, which means you will still be able to share documents with people who are broke because they’ve spent all their money on Microsoft Office. It’s also multiplatform: it will run on Windows, Mac OS X, Linux, and FreeBSD.