NEXTAPP 
Echo client-side JavaScript as used in the "Web Access" system of the the Android app FX File Explorer.
Echo
Open Source Web Framework
Echo is a client-side and server-side web framework. Applications can be built purely in client-side JavaScript. Or purely in server-side Java. Or with a combination of both. HTML and CSS interaction is not necessary, but it can be used extensively to create specialized reusable custom components. For more information, visit the Echo site at echo.nextapp.com.