• World Bank
  • The European Communication Network
  • European Environment Agency
  • Global Environment Facility
  • United Nations Environment Programme
  • ECOLEX - A gateway to Environmental Law
  • United States Environmental Protection Agency
  • Regional Environmental Center for Central and Eastern Europe
  • DEPA
  • Bulgarian Academy of Sciences
  • BGGLOBE - everything in Bulgaria
  • Institute for Environment and Sustainability
  • BlueLink - Civil Environmental Gateway to Bulgaria
  • Environmental Content Sharing in South Eastern Europe
  • Bulgarian institute for standardization (BDS)