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.

Components for viewing, navigating, text extracting and editing PDF files.

uses PDFium open-source PDF rendering engine
available for .NET 2 - 4.7
source code included in registered version
royalty free distribution in applications

Entity Developer is a powerful ORM designer for ADO.NET Entity Framework, NHibernate, LinqConnect, and LINQ to SQL. You can use Model-First and Database-First approaches to design your ORM model and generate C# or Visual Basic .NET code for it. It introduces new approaches for designing ORM models, boosts productivity, and facilitates the development of database applications.

Spire.Doc for .NET is a professional Word .NET library specifically designed for developers to create, read, write, convert and print Word document files from any .NET platform with fast and high quality performance.

Enjoy components for every need: navigation and layout, data management and visualization, editing, interactivity and more. In our 11 years of aggressive product development including 3 major and up to 6 minor releases per year we have implemented, tested and optimized over 4,000 features in Telerik ASP.NET controls.

Before universal apps came along, creating apps for Windows 8.x Store and Windows Phone 8 was mostly a two-app project. Thanks to the universal Windows paradigm across devices, developers write code once and deploy on multiple Windows platforms with just small tweaks on the user interface. Telerik UI for Windows Universal plays nice with Microsoft Visual Studio and creates a Shared project template for Universal Apps allowing the same app to be written for Windows 8.1 Store and Windows Phone 8.1 with little code changes.

Ozeki VoIP SIP SDK provides a first-rate technology for softphone development. Instead of wasting time for long development process on your own, you can take advantage on this decent software development kit. You will see how easy it is to create a softphone when you use Ozeki SIP SDK. A basic programming knowledge is enough, since Ozeki SIP SDK provides the base for the VoIP solution you are working on.

Softgroup .Net Forms Resize is a fast, small and lightweight .NET component that gives your applications resolution independence. Softgroup .Net Forms Resize automatically resize all controls and fonts contained in a .Net Windows Form as they are sized. Softgroup .Net Forms Resize is the most popular and multi award winning .Net component software for:

Originality, creativity and vision.
Professional appearance and structure.
Flexibility through integration across multiple-platforms.
Leadership in the software sector.
Faster resize engine.
No need to write code

SmartAssembly is a .NET obfuscator, error reporting, and feature usage reporting tool designed to help .NET developers produce better quality applications. This all-round solution will obfuscate and protect your .NET code, and add powerful error-reporting and feature-usage reporting capabilities to your application.

Best Document Imaging SDK
Document viewing, processing, printing and scanning (TWAIN & WIA).
Built-in fast and accurate document conversion engine (ie: docx to pdf).
Reading, cleaning, writing and converting documents in more than 100 formats, TIFF, PDF, DOCX, DICOM & JBIG2 included.
OMR, OCR, MICR, Document Recognition, barcode reading and writing (linear & 2D).
Annotations for image and PDF within Windows and Web applications.
Color detection & MRC engine for image and PDF compression.