The World Income Inequality Database (WIID) provides the most comprehensive set of income inequality statistics available. Downloadable for free for use by researchers and policymakers. it aims to tackle the problem of inequality and create a more inclusive society.
In addition, the WIID visualisation tool can be used to quickly generate charts that shed light on the problem of inequality around the world.
Research output based on WIID data continues to be published, ranging from a study on the drivers of within-country inequality, to the design of redistributive transfer systems in developing countries.
More information on the WIID: https://www.wider.unu.edu/project/wiid-world-income-inequality-database
More information on the WIID visualization tool: https://www4.wider.unu.edu