Xamarin.Android - Integrated environment for building not only native Android but iOS and Windows apps too.
scriptcs - scriptcs makes it easy to write and execute C# with a simple text editor.
Qt Creator - Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.
VisualNEO Win - Create Windows software with VisualNEO, the easiest tool to develop powerful applications.
Rider - Rider is a cross-platform .NET IDE based on the IntelliJ platform and ReSharper.
Easy code - Easy Code is the visual assembly programming environment made to build 32-bit Windows applications.