Brazil

• GIS data from IBGE (Instituto Brasileiro de Geografia e Estatística)
  In Portuguese:
  http://www.ibge.gov.br/home/geociencias/default_prod.shtm#TERRIT
  In English:
  http://www.ibge.gov.br/english/ (click Download and Geosciences)

UK

• Mapping Data and Geographic Information from Ordnance Survey
  http://www.ordnancesurvey.co.uk/oswebsite/opendata/index.html

  Data download site:
  https://www.ordnancesurvey.co.uk/opendatadownload/products.html