Delphi and C++ Builder component for serial communication for Windows.
communication with devices connected to serial port
easy of use and very powerful
uses multithreading and overlapping for maximum performance
available for Delphi/C++ Builder 5 - 10.3 and Lazarus 1.8.4
source code included in registered version
royalty free distribution in applications

With FastReport.Net, you can create application-independent .Net reports. In other words, FastReport.Net can be used as a standalone reporting tool.

Includes powerful visual report designer for creating and modifying the reports. Your application can run the designer from the code.
Includes online report designer for ASP.Net (only in Enterprise edition)
Connect to any database, use any of its tables or create queries
Add dialogue form(s) to your report to prompt for parameters before running a report
Using built-in script you can manage the interactions with dialogue form controls and perform complex data handling
Finally, view the result and print or export it to many common document formats

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.