Many international organizations have embraced open data, which typically includes data on project funding, loans and financing, budgets, contracts, and procurement. The group spearheading the effort is the International Aid Transparency Initiative. Their Standard is a common, open format for publishing data which makes it possible for government officials, NGOs, and ordinary citizens to see or display funding information online.
International Monetary Fund
Aid Data. Data from bilateral and multilateral agencies at the project level. Includes data visualization tools, articles on development aid and geo-coded data at the project level. See replication datasets with research articles on aid allocation effectiveness.
d-Portal. Easy to use, comprehensive, open source data from hundreds of national governments, NGOs and multilateral organizations. From the International Aid Transparency Initiative.
Illicit Financial Flows. Illegal movements of money or capital from one country to another from funds that are illegally earned, transferred, and/or utilized.
UN Multi-Partner Trust Fund Office. Project funding data gateway from agencies in the UN Family of Organizations.
Public procurement is the purchase of goods, services by governments makes up a significant portion of many economies.
The OECD maintains a web site on this topic and has also published the OECD Convention on Combating Bribery of Foreign Public Officials in International Business Transactions.