Open Source Software
Open Source Software for Windows
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Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License
Shutter is a feature-rich screenshot program. You can take a screenshot of a specific area, window, your whole screen, or even of a website - apply different effects to it, draw on it to highlight points, and then upload to an image hosting site, all within one window. Shutter is free, open-source, and licensed under GPL v3.
Recordmydesktop is a desktop session recorder for GNU / linux that attemps to be easy to use, yet also effective at it's primary task.
osTicket is a widely-used open source support ticket system. It seamlessly integrates inquiries created via email, phone and web-based forms into a simple easy-to-use multi-user web interface. Manage, organize and archive all your support requests and responses in one place while providing your customers with accountability and responsiveness they deserve.