Xamarin Studio is a powerful and versatile integrated development environment (IDE) for creating native mobile apps for the iOS, Android, and Windows platforms. It is a part of the Xamarin platform and is used to develop apps in C#, a language that is also used to program desktop and web applications. Xamarin Studio provides a drag and drop user interface to help developers quickly and easily create their apps. It also contains a variety of debugging, testing, and profiling tools to ensure that apps are as efficient and bug-free as possible. Xamarin Studio also allows developers to share code across platforms, saving time and effort when creating apps for multiple platforms.
Discontinued Aptana is still under development on GitHub but the latest version, 3.6.1, was released in October 2014. It lacks Java 8/9 features, as well as more recent JavaScript and HTML 5 features.