GMX Email is a basic webmail service appropriate for internal organizational use. Gooey provides pre-built interface components like tables and forms that can be customized through limited color and style options to maintain consistency. Drupal allows for some customization of the default theme through options like color sets, logo display, and favicon but offers less flexibility than eWedding. eWedding offers fully customizable wedding websites, giving users more themes and styles to choose from with varying looks and feels, color variations within themes, and the ability to change themes like in Wordpress.