Kaxaml is a lightweight XAML editor which makes coding in XAML (Extensible Application Markup Language) simpler and faster. Kaxaml is a great choice for developers and designers who prefer working in an easy-to-use, visual XAML editor. The app supports all the latest XAML features, including features from the Windows Presentation Foundation (WPF), and Silverlight. It also offers syntax highlighting, auto-completion, real-time preview, and built-in text editing and formatting tools. The app also includes a range of code snippets which can be used to quickly insert common XAML code. Kaxaml is a great choice for creating modern, interactive web applications, as well as for creating rich user interfaces for desktop applications.
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.