Text2MindMap.com is an idea mapping/idea web tool that you can use, save, and share without creating an account. Simply go to the link and start building your idea/concept map. I have posted other idea mapping tools before, but I like this one because it doesn't require the students to create an account. They can simply show up and start working. After completing the project, you or your students can download the final product as an image or a PDF. You can also save your project to continue working on it in the future. When you click save, it will give you a unique URL to your project that allows you to return to work. These features, along with customization tools, makes this a web 2.0 tool worth using.
Applications for Education: Have your students make an idea map about anything! Use it as a learning tool, a review tool, or a brainstorming tool. I have used them in the past for all of those things and I like the results. This would be a great tool to use in a reading class: Main idea in the middle, with supporting details shooting out from there. In any of the social studies classes, simply choose a topic (ancient Rome, gladiators, civil war battles, people of the American Revolution, etc.) and start mapping them out. Great way for kids to create a visual of information to learn or review. Or, use it yourself to help plan out a project or unit.