XMPGenerator is a website that I have published since 2013 for provide a XMP file generation service.
I have published some days ago an App that provides the same service of the XMPGenerator website at Windows Store. I can do it by using the APIs of the XMPGenerator website.

The App is free and it contains a banner advertisement.
For more information you can visit the page XMPGenerator App.
If you want to know more about the XMPGenerator website, you can go here.

Also, it is my intention make it available for Android. This version is ready for deployment but I have to resolve some "formal" issues with Google Play.