Example free maps from https://www.geo.admin.ch/en/home.html: WMS link: http://wms.geo.admin.ch/?REQUEST=GetCapabilities&SERVICE=WMS&VERSION=1.0.0&lang=de Please gett Maps better Integrated and allow to use WMS maps as an Overlay to normal maps. Also pre-set the icon Image from the Website Faveicon and if Possible auto generate a Legend. If not Possible please add an example to show what the legend Image should look like. If possible please also add an Edit button to the new created map to allow correcting the Data.
With the latest Marble development version this should work much better than in the past: The WMS integration has been considerably improved, you can now select multiple layers and you can now choose OpenStreetMap (for a start) as a "backdrop" layer. Also given the amount of layers at https://wms.geo.admin.ch/ Marble now provides a search-lineedit so that the layer selection becomes searchable. Additionally the preview image for the generated map theme is created based on the boundaries (which oddly doesn't seem to work with https://wms.geo.admin.ch but works most of the time).
Oh and we also have experimental WMTS support integrated.
*** Bug 232475 has been marked as a duplicate of this bug. ***