Use OCR.NET component to retrieve text from image, for example from scanned paper document.
uses Tesseract OCR engine and Leptonica image processing library
available for .NET 2 - 4.7
source code included in registered version
royalty free distribution in applications

Xamarin Forms is great if you want to develop apps for different mobile platforms. But when it comes to touch gestures, it is still very limited.
For more than a year they only had the TapGestureRecognizer. Although they did add some others lately, they still don't provide all information which you need. Furthermore the API which they use has been copied from iOS and is not what a .NET developer would expect.

Sibelius is the world's best-selling music notation software, offering sophisticated, yet easy-to-use tools that are proven and trusted by composers, arrangers, publishers, educators, and students alike. And with the new Sibelius, you can access the software in more affordable ways than ever.

A powerful automation software that helps you configure programs to start different activities on your computer, assign keystrokes for performing various operations, define abbreviation strings for your frequently used text, and manage mouse gestures.

Xamarin Forms is great if you want to develop apps for different mobile platforms, but it is missing a critical functionality which every device with a touch screen needs. It cannot handle the various touch gestures. MR.Gestures adds Down, Up, Tapping, Tapped, DoupleTapped, LongPressing, LongPressed, Panning, Panned, Swiped, Pinching, Pinched, Rotating and Rotated events to each and every layout, cell and view and to the ContentPage. These events will be raised when the user performs the corresponding touch gesture on the element. In the EventArgs passed to the handlers you can see exactly what happened.

Essential Studio for WinRT contains all the controls you need to build line-of-business tablet applications, including the fastest grid and chart on the market, maps, RDL Report Viewer, rich text viewer, diagrams, etc. Also included is a unique set of libraries for generating Excel, Word, and PDF documents from WinRT apps.

Video editing has never been so easy! MAGIX Video easy HD is the perfect beginner program for the whole family. It's easy to make impressive videos in no time at all even without any previous video editing skills. Create your own videos using the new user interface with extra large icons and sliders, either using the mouse or touchscreen gestures. Transform recordings of family celebrations, vacations, or special events into breathtaking DVDs and Blu-ray Disc, and share them friends and family.