1. http://www.wolframalpha.com/

Wolfram Alpha introduces a fundamentally new way to you get knowledge and answers—not by searching the web, but by doing dynamic computations based on a vast collection of built-in data, algorithms, and methods. You ntresting Practice math problems and more online with Wolfram Problem Generator.
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2. http://unfurlr.com/

unfurlr.com it is a helpful site .You find the original URL that’s hiding behind get a short URL.
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3. http://www.onlineocr.net/

This is a OnlineOCR.net it’s free web-based Optical Character Recognition software (OCR) that allows you to convert scanned PDF documents , faxes, photographs or digital camera captured images into editable and searchable electronic documents including Adobe PDF, Microsoft Word, Microsoft Excel, Rtf, Html and Txt.

It’s Free Online OCR is a free service in a “Guest mode” (without registration) that allows you to convert 15 images per hour.Without installation on your computer. Recognize text and characters from PDF scanned documents (including multipage files), photographs and digital camera captured images.
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4. http://otixo.com/

Copy and Move files from one service to another without downloading to your computer. It’s as easy as drag-and-drop.Manage all your clouds from one login with Otixo. Connect services like Dropbox, Box, OneDrive, Google Docs, SugarSync, Picasa, Amazon S3, FTP sites and WebDav drives…all from one simple app.
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5. http://tagmydoc.com/

TagMyDoc easiest way to validate any version of any document.Take comfort in knowing that you will always be working with the most up to date version of any document. No app required dealing with multiple versions of documents you’ve previously shared with your viewers, all the while saving you time and money.
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6. https://imo.im/register

Interesting chat with your buddies on Skype, Facebook, Google Talk, etc. from one place.
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7. https://office.com

Office gives you the freedom to get work done virtually anytime, anywhere, and on any device,download templates, clipart and images for your Office documents.
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8. http://faxzero.com/

faxzero.com it is a intresting site, You send an online fax for free
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9. http://downforeveryoneorjustme.com/

Find if your favorite website is offline or not?

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10. https://www.youtube.com/disco

Quickly create a video playlist of your favorite artist.