In Worklight 5.0.5.x:
- Vista/Win7 gadgets
- Windows Phone 7.0
In Worklight 5.0.6.x:
- Vista/Win7 gadgets deprecated (removed in Worklight 6.0)
- Windows Phone 7.5
- Windows Phone 8
- Windows 8
As you've mentioned, JSONStore is available only for Android and iOS; you can instead use IBM Worklight Encrypted Offline Cache, or the HTML5 standard Application Cache.