...
This is used to group widgets in one container.
Table
This is used for tables that are mostly used to neatly organize widgets.
Vertical Line
This is used to draw a vertical line in a table or any where else
Horizontal Line
This is used to draw a horizontal line in a table or anywhere else
Repeat Section
This is used as the container for widgets to be repeated and rows.
...
This is used for capturing and playing of sounds and videos.
Logo
This is used to includes static pictures or images on a form. You would need to set its External Source property to the image url as explained at the Widget Properties Pane