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Museum of Websites - Curated gallery of how internet companies changed over time
Wren - Offset your carbon footprint by saving rainforests
Vibe Boost - An interactive digital museum of video-based art.
Klima - Go carbon neutral
Louvre Museum Online - Explore the entirety of the Louvre's collection for free
Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.