MARBLE seems to use the KDE lacks a generic widget that can be used to display geographical maps.
- Initial support for Google Earth KML files is there already, so it's possible to display placemarks easily.
- Marble uses a minimal free dataset that can be used offline. Currently the total amount of data that is meant to be shipped is about 5 MB.
- Marble runs decently without hardware acceleration. It just uses Arthur as a painting backend and does NOT use OpenGL
- Marble should start up almost instantly. Currently it "cold" starts fully within 2-5 seconds. On each subsequent start it takes about one second.
Also, OpenStreetMap data can be used freely under the terms of the Creative Commons Attribution-ShareAlike 2.0 license