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Calcoolate provides users with a simple calculator with advanced expression support, mathematic functions, and history for viewing past calculations.

"5 reasons to get back into Google Wave - with your students"

Open Cobalt Alpha is the first step in a long term project to make available to all people a free and open source platform for constructing, accessing, and sharing virtual workspaces for research and education. This 3D multimedia wiki technology makes it easy to create deeply collaborative and hyperlinked multi-user virtual workspaces, virtual exhibit spaces, and game-based learning and training environments that run on all major software operating systems. By using a peer-based messaging protocol to reduce reliance on server infrastructures for support of basic in world interactions across many participants, Open Cobalt makes it possible for people hyperlink their virtual worlds via 3D portals to form a large distributed network of interconnected collaboration spaces. It also makes it possible for schools and other organizations to freely set up their own networks of public and private 3D virtual workspaces that feature integrated web browsing, voice chat, text chat, and access to remote desktop applications and services.

Heather Wolpert-Gawron's blog

"Timeline of historic inventions"