http://code.google.com/p/osifont/
"In some european countries, CAD projects must have font which conform to IS0 3O98 specification. Comercial CADs has this font, but free CADs not. There is no available free font yet, so this project will fix this. This font will be created completely from the scratch. Font is created with free tools like FontForge, Inkscape, Gimp." Alexandre
