Nokia Xpress Web app builder(XWAB) has been ramped down effective 27 August 2014. You can still build web apps using Nokia Asha web apps tools 3.0.Note that "cloud preview" functionality within web apps tools will no longer be available effective 27 August 2014. We recommend previewing apps locally via the Web App Simulator (WAS) included as part of the web apps tools download.
We recommend using the Windows Dev Center for the latest on developing universal Windows apps for smartphones and other devices.
For continued support on other platforms, you may use the emulators included in the SDKs: