Microsoft started adding support for third-party development tool vendors since the launch of Windows Phone 8. Marmalade is one of them and it just released the final version of Marmalade 7, their cross-platform C++ SDK that includes support for Windows Phone 8. Marmalade, in partnership with Microsoft has announced a free 3-month Marmalade license extension and a Free Windows Phone 8 Device when you get your apps using Marmalade SDK approved on the Windows Phone Store.
Read about this offer here.
via: Windows Phone blog