PhotoSEAM has a modern, easy to use multidocument interface.
Here is the typical scren of PhotoSEAM. You see opened tiles, a Brush Tool Bar on the left side and a Color & Texture Bar and Brushes Bar on the right side. The edit tools, like copy/paste, zoom or text are on the top toolbar.
However some tools will show also different Bars and options.
See the description of the main toolbars.