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.

StyleControls is a stable, powerful package (more than 100 components), which uses Classic drawing, system Themes, GDI+ and VCL Styles. This package contains the unique solutions to extend standard VCL controls and also has many unique, advanced controls to create modern applications (UWP design). Also with this package you can really improve applying and using of VCL Styles in your application.

AlphaControls - a set of common and some unique components that support skins (AlphaSkins), as well as having some additional features. All skin elements can have their own properties for advanced drawing the gradient, realistic framework, semi-transparent and blurry shadows. Graphics functions produce all the calculations and drawing in real-time. Added property BoundLabel for editing elements. Handled various mouse events, which gives some additional features components. Manager prompts controls the tips in the application and gives them a beautiful view with a lot of settings that can be changed by a special designer. Analogs of standard components provide all the functionality and add a lot of new solutions to improve software quality and their appearance.

F-IN-BOX is a .NET component to enhance Macromedia / Adobe Flash Player ActiveX features. It does not use its own engine to display movies but provide a wrapper around official swflash.ocx/flash.ocx code instead. Thus it is possible to avoid certain Macromedia / Adobe Flash Player ActiveX limitations.

A powerful desktop app for creating responsive websites using the Bootstrap framework. Bootstrap Studio is a powerful desktop app for designing and prototyping websites. Bootstrap Studio is a desktop application that helps you create beautiful websites. It comes with a large number of built-in components, which you can drag and drop to assemble responsive web pages. It is built on top of the hugely popular Bootstrap framework, and exports clean and semantic HTML. Thousands of developers and designers use it every day. We are sure you'll love it too!

FastCube is a set of OLAP Desktop components. It supports Delphi 7, 2005, 2006/Turbo, 2007, 2009, XE, XE2, 2007, 2009, XE2, XE3, XE4, XE5, XE6, C++Builder 2007, C++ Builder 2009, C++Builder XE2 - XE6, RAD Studio 2009, Embarcadero RAD Studio 10.2 Tokyo and higher and Lazarus.

Telerik UI for Silverlight includes a wide range of controls from small UI components such as Rating to powerful data-driven controls like GridView. The suite provides a variety of data visualization tools which allow you to display and edit your data in many different ways. Manipulate your row data in a GridView or Spreadsheet and then visualize it through PivotGrid, or any of the other charting and diagramming tools. Choose from a number of components for daily or business planning such as ScheduleView where users can easily plan their day and GanttView which allows users to visualize and manage any project planning data. Telerik UI for Silverlight comes complete with customizable UI controls for a variety of needs and options, which makes it the ideal choice for any Line of Business Application.

AlphaControls - a set of common and some unique components that support skins (AlphaSkins), as well as having some additional features. All skin elements can have their own properties for advanced drawing the gradient, realistic framework, semi-transparent and blurry shadows. Graphics functions produce all the calculations and drawing in real-time. Added property BoundLabel for editing elements. Handled various mouse events, which gives some additional features components. Manager prompts controls the tips in the application and gives them a beautiful view with a lot of settings that can be changed by a special designer. Analogs of standard components provide all the functionality and add a lot of new solutions to improve software quality and their appearance.

DIHtmlParser is a component suite to parse, analyze, extract information from, and generate HTML, XHTML, and XML documents for Delphi (Embarcadero, CodeGear, Borland).

Telerik UI for WPF includes a wide range of controls from small UI components like Rating to powerful data-driven controls like GridView. The suite provides a variety of data visualization tools to allow you to display and edit your data. Manipulate your row data in a GridView or Spreadsheet and then visualize it through PivotGrid, our charting or diagramming tools. Discover multiple components for daily or business planning such as ScheduleView where users can easily plan their day and GanttView which allows users to visualize and manage any project planning data. Telerik UI for WPF comes complete with customizable UI controls for a variety of needs and options, which makes it the ideal choice for any Windows desktop application.