IATI is "a global initiative to improve the transparency of development and humanitarian resources and their results to address poverty and crises" The home page at https://iatistandard.org/en/ reports more than 1.1 million records contributed by 957 posting organizations. The home page provides links to information on the data, as well as links to reference pages.
The "tools and resources for data use" page at https://iatistandard.org/en/using-data/iati-tools-and-resources/ provides links giving further information on data availability and the different tools available for downloading data.