Seavus Dropmind seems to be a very interesting Mind Mapping Software. I had the opportunity to test the Beta Version and was seduced by the clarity and the simplicity of this Software. Many features still have to be improved like PDF export or changing branch's lines thickness.
Seavus Dropmind permits to import from Mindmanager (it works well) and give us many possibilities to customize our maps : change background, lines colors, insert connections, boundaries and son on. Like you can check out in this map (click on it to see the original), the result looks pretty cool.