ABAP in Eclipse now offers eclipse native editor support for Web Dynpro ABAP(WDA) Component and Web Dynpro ABAP Application.
In the project explorer, right-click on the object or double click to open WDA Component or Application in the eclipse editors. You can also use the shortcut ctrl + shift + A to search and launch the WDA Component or Application editor.
Web Dynpro Component Editor:

Web Dynpro Application Editor:

To test any WDA Application, click on the hyperlink "URL" and the application is launched within Eclipse in the pre-configured browser.