The functionality of Openoffice Base is not quite as good as in Mirosoft Access, especially when it comes to reports, but it is a nice and free application that will be useful in many situations.
For a comparison of Base vs Access, see http://oakleafblog.blogspot.com/2005/10/openoffice-20-base-matches-microsoft.html
Another almost free desktop database tool is Kexi (http://www.kexi-project.org/. The Linux version is free, but a small cost is charged for the full Windows version.
More free software:
> Open Office Draw - A Free Drawing tool
> Open Office Impress - Free Powerpoint Alternative
> Open Office Writer - Free Microsoft Word Clone
> Open Office Calc - Free Microsoft Excel Clone