Organisation for Economic Co-operation and Development (OECD)
Although the Organisation for Economic Co-operation and Development publishes a variety of data on topics and countries related to budget and spending via its data portal (data.oecd.org, its annual reports and its latest financial statements (2015) are published in PDF formats.
Grants/Projects/IATI
Unlike the World Bank or the International Monetary Fund, OECD does not dispense grants or make loans.
Procurement
The OECD publishes calls for tenders (PDF) and a list of suppliers to whom major contracts have been awarded from 2012 to present (PDF). This list does not include amounts of contracts awarded. Data is not available in machine readable open format.