InquisitorJax 

given latitude and longitude, get the country or american state name where the point is located. Offline operation - no api calls necessary

Image utils for xamarin projects ResizeImage AnalyseImage (get size and orientation)

Wrap your single responsibility logic using the command pattern. var commandResult = await MyCustomLogicCommand.ExecuteAsync(params);

Some common value converters for xamarin forms. BooleanToInvertedBoolean ; ByteArrayToImageSourceConverter ; EmptyStringToFillTextConverter ; HexStringToColorConverter ; NullValueToBooleanConverter ;... More information

Common value converters for Xamarin Forms bindings