MapCSS is a stylesheet language for maps. It works just like the CSS you'd use for web design.

Take vector data from OpenStreetMap or a similar source; add a MapCSS stylesheet; feed it into a renderer - and you have a beautiful custom map.

See an introduction to MapCSS.

Resources

MapCSS renderers

Other MapCSS libraries and utilities

Other programs supporting MapCSS

Doing something cool with MapCSS? Tell the mailing list!