Open Source Answer to WPF / Silverlight

Does the open source community have in the works a technology that is independent from the M$ IP contaminated projects such as Mono and Moonlight? Is there a top to botton wholly open source technology that the open source community can leverage that gives the same type of graphical power, or at least the potential power that is currently weilded by technologies such as Adobe Flash, M$ WPF / Silverlight? I hope to find out soon....