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

Seamless access to cloud services from FireMonkey applications. The TMS FMX Cloud Pack contains components that offer integration with several cloud services.

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.

Delphi and C++ Builder camera component for Windows.

uses DirectShow 9 API
available for Delphi/C++ Builder 7 - 10.2 and Lazarus 1.8.2
source code included in registered version
royalty free distribution in applications

This patch resolves a number of issues pertaining to deploying RAD Server EMS packages on Linux using Delphi 10.2.3 Tokyo. In some circumstances, when deploying an EMS package to Linux, libmod_emsserver would fail to start due to an exception related with the TEndpointContext declaration.

LiveXAML runs while you are debugging your application inside an emulator. Whenever you save any XAML file, it automatically updates the running application. LiveXAML has no restrictions on libraries or code usage. You can interact with the interface as you normally do. No additional configuration needed besides initial installation.

ZylSerialPort.NET is a thread based, event driven, asynchronous / synchronous serial port .NET class / component. Use ZylSerialPort.NET component to easily communicate with external devices on serial port connection, such as modems, bar code readers, GSM modules and others.

Unofficial YouTube Api for Delphi VCL & FMX (FireMonkey)

Version: 1.4 ( 25/02/2018 )
+ Fix problems

Create modern-looking & feature-rich Windows applications faster with well over 400 components in one money and time saving bundle for Delphi 7, 2007, 2009, 2010, XE, XE2, XE3, XE4, XE5, XE6, XE7, XE8, 10 Seattle, 10.1 Berlin, 10.1 Berlin Starter Edition & C++Builder 2007, 2009, 2010, XE, XE2, XE3, XE4, XE5, XE6, XE7, XE8, 10 Seattle, 10.1 Berlin, D10.2 Tokyo.