Junnark
Junnark.Com Inc. has been making business-enabled, industry standardized, database driven, web-centric software applications for over 22 years. They develop software applications using bleeding-edge Microsoft technologies and tools such as: ASP.NET Core, ASP.NET MVC, C#, Visual Basic, Microsoft SQL, and Visual Studio.
Xamarin
Xamarin was founded in May of 2011 in Boston, Massachusetts. Their mission is to produce the best software development tools in the world, and to make it fast, easy and fun to build great mobile applications. Xamarin is composed of more than 20 members of the team that built Mono, with ten years of experience working together to create a great developer platform.