The World Bank is a global partnership of almost all countries in the world, that provides extensive data on economic development and related topics. It is five institutions working for sustainable solutions that reduce poverty and build shared prosperity in developing countries.
As such the site provide not only in depth information about topics related to economic growth in developing countries, but also on sharing working sustainable solutions for the benefit of all. Their data set bank has a wide range of information to draw from various areas of development.
Link: The World Bank and The World Bank Data
The World Bank is a SDG partner.