We tend to think of Open Source Software as freeware and that you get what you pay for. While this is sometimes true, we feel that some of the best software out there is open source. We encourage you to look at some of these packages as potential alternatives to commercial software.
Be sure to check out our Internet Software section which has some great open source projects as well.
LibreOffice is a comprehensive, professional-quality productivity suite that you can download and install for free, with no fear of copyright infringement. There is a large base of satisfied LibreOffice users worldwide, and it is available in more than 30 languages and for all major operating systems, including Microsoft Windows, Mac OS X and GNU/Linux.
This is seriously great software and is very compatible with MS Office files. Everyone should try this before buying commercial software.
Great software for managing your ebook collection. More features than you probably need in this powerful utility.