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Exploratree is a free web resource where you can access a library of ready-made interactive thinking guides, print them, edit them or make your own. You can share them and work on them in groups too.

The IHMC CmapTools program empowers users to construct, navigate, share and criticize knowledge models represented as concept maps. It allows users to, among many other features, construct their Cmaps in their personal computer, share them on servers (CmapServers) anywhere on the Internet, link their Cmaps to other Cmaps on servers, automatically create web pages of their concept maps on servers, edit their maps synchronously (at the same time) with other users on the Internet, and search the web for information relevant to a concept map.

Online video editing.

Paint.NET is free image and photo editing software for computers that run Windows. It features an intuitive and innovative user interface with support for layers, unlimited undo, special effects, and a wide variety of useful and powerful tools. An active and growing online community provides friendly help, tutorials, and plugins.

"WatchKnow has indexed over 20,000 educational videos, placing them into a directory of over 3,000 categories. The videos are available without any registration or fees to teachers in the classroom and to students at home 24/7. Users can dive into our innovative directory or search for videos by subject and age level. Video titles, descriptions, age level information, and ratings are all edited for usefulness. Our Web site invites broad participation in a new kind of wiki system, guided by teachers. We have had a tremendously positive response from educators to the website. If we continue to work together, we can create an incredible, free, educational resource for students across the world."

"Markup lets you draw on any webpage with a variety of tools to express your thoughts, make a point or just simply edit." This is a bookmarklet -- no download required!

CAST is a non-profit research and development organization dedicated to Universal Design for Learning (UDL). UDL research demonstrates that the challenge of diversity can and must be met by making curriculum flexible and responsive to learner differences.