The TatukGIS Developer Kernel (DK) is a powerful GIS component (SDK) for custom developing stand-alone, client-server, web server, embedded, and mobile applications. It is ideal for adding GIS functionality to already existing products, porting software applications from less attractive GIS platforms, and developing new applications from scratch. DK product editions are available for multiple development platforms:

Microsoft .NET for WinForms and WPF
Microsoft ActiveX/OCX
Microsoft ASP.NET (for web solutions)
Microsoft .NET Compact Framework (for mobile solutions)
Embarcadero Delphi/C++Builder VCL

Konopka Signature VCL Controls is a suite of over 200 Windows UI controls designed to make your applications more intuitive and visually stunning, Delphi and C++Builder developers can modernize and simplify every Windows user experience. Konopka Signature VCL Controls deliver unsurpassed attention to detail, ease of use, and flexibility for both the end-user and the developer.

Code maintainability improves. This positively impacts the productivity of development teams. Over time, developers become educated about rules to follow and their skills improve. Architects can anticipate the impact of code changes. The right decisions are taken early. Since quality is checked automatically and continuously with a strong focus on recent changes, both in Visual Studio and in the DevOps, the team builds better code. Executives gain control over costs and risks thanks to light being shed on development facts and trends that matter most.

dotConnect for SQLite is a high-performance ORM enabled data provider for SQLite that builds on ADO.NET technology to present a complete solution for developing SQLite-based database applications. It introduces new approaches for designing application architecture, boosts productivity, and facilitates the development of database applications.

dotConnect for Oracle is a high-performance ORM enabled data provider for Oracle that builds on ADO.NET technology to present a complete solution for developing Oracle-based database applications. It introduces new approaches for designing application architecture, boosts productivity, and facilitates the development of database applications.

Konopka Signature VCL Controls is a suite of over 200 Windows UI controls designed to make your applications more intuitive and visually stunning, Delphi and C++Builder developers can modernize and simplify every Windows user experience. Konopka Signature VCL Controls deliver unsurpassed attention to detail, ease of use, and flexibility for both the end-user and the developer.

Fantastic value on our .NET development tools for performance optimization and debugging. Software quality is a big deal — especially for professional developers and testers. So we're offering the full .NET Developer Bundle for a fraction of the price of the individual tools.

GemBox.Spreadsheet is a .NET component that enables you to read, write, edit, convert, and print spreadsheet files from your .NET applications using one simple API. With GemBox.Spreadsheet you get a fast and reliable component that’s easy to use. It requires only the .NET framework, so you can deploy your application easily without having to think about other licenses. And it’s up to 250 times faster than Microsoft Excel automation!

Entity Developer is a powerful ORM designer for ADO.NET Entity Framework, Entity Framework Core, Hibernate, LinqConnect, Telerik Data Access, and LINQ to SQL. It introduces new approaches for designing ORM models, boosts productivity, and facilitates the development of database 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.