Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
Xamarin.Android - Integrated environment for building not only native Android but iOS and Windows apps too.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
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.
PSPad - Text, code and hex editor.
Rider - Rider is a cross-platform .NET IDE based on the IntelliJ platform and ReSharper.