ClassTools.net: Games for Education
Free games, tools, and graphic organizers, including a Venn Diagram, priority chart, timeline, and timer. You can create your own casual games with questions, like a word game based on "Space Invaders."
Swftools.com - Flash tools, utilities, applications, components
Directory of tools that do at least some of what Flash can do or that work with Flash--presentation tools, quiz tools, PowerPoint to Flash converters, ActionScript editors, etc. Most have free demos; not many open source options in this area.