CIA World Factbook:  https://www.cia.gov/library/publications/the-world-factbook/
This is a useful resource for providing basic country facts (e.g., historical background, population, economy, etc.).

Geert Hofstede: http://www.geerthofstede.com/
This is the most up-to-date resource on Hofstede’s dimensions of culture, which enables country comparisons in an interactive manner.

GLOBE project: http://globeproject.com/
This is the official website presenting the data from the GLOBE project and its 2014 GLOBE CEO study.

Transparency International: http://www.transparency.org/
This website provides data and general information at the industry and country level including the Corruption Perception Index and the Bribery Index put together by the NGO Transparency International.

World Values Survey: http://www.worldvaluessurvey.org/
This website provides a summary of the World Values Survey project and it most recent data (Wave 7).

Kwintessential: http://www.kwintessential.co.uk/resources/
This website provides a useful guide to etiquette, business, and culture around the world.

Negotiation: http://www.negotiation.biz/
This website provides a useful aid for the process and practice of intercultural negotiations.

Ethnologue: Languages of the World: https://www.ethnologue.com/
This is a useful source of information about the languages of the world.