https://garage.maemo.org/projects/osm2go/
http://wiki.openstreetmap.org/wiki/Osm2go
It’s written in GTK+/C

GTK sous Windows
You will need to get the GLib, cairo, Pango, ATK, and GTK+ developer packages to build against GTK+
The most natural toolchain to use together with these packages would probably be […] MinGW
+ All-in-one bundle + Third Party Dependencies