Xamarin.Android - Integrated environment for building not only native Android but iOS and Windows apps too.
Wordapp - A free word-processing and publishing platform
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.
AppConvertly.com - AppConvertly - convert your website to Android & iOS app. No coding required. Easy solution to reach new audience in 5 minutes https://www.appconvertly.com/
Rider - Rider is a cross-platform .NET IDE based on the IntelliJ platform and ReSharper.
Appmaker WP - Convert WordPress to Native Android & iOS App.