Is there a decent open source map-editor?

I would like to have an open source map editor for drawing a city map? I don't want to use OpenStreetMap. It will be a custom map project.

I don't need an advanced GIS system, but a simple map-editor, where I can use my own custom symbols. It must support Transverse Mercator projection and be able to calculated distances between objects on the map.

Answer

Depends on your needs.

QGIS, gvSIG, etc, are all good map editors. Just download OSM data and use these to create your maps.

Also, you might consider creating your map with one those above, and then go to something like InkScape to finish the job.