There are Country Guides that offer country-specific overviews of direct tax regimes. These are written by in-country experts and cover topics such corporate taxation, important miscellaneous direct taxes, special tax regimes, and  mandatory disclosure rules.

An International Withholding Tax Chart Builder compares withholding tax consequences of investing or providing services in multiple countries. The tool displays domestic and treaty rates for different types of income streams and payments and also provides direct links to relevant treaty articles.