NationMaster

NationMaster provides country statistics, market sizing and industry trends across 300 industry verticals, drawing on more than 50,000 industry stats updated from sources such as national statistics agencies, governments and international organizations. Its data covers 180 countries, with comparisons available across 305 countries in total, spanning sectors from agribusiness and construction to ICT, media, pharmaceuticals and financial services.

The site's ads.txt file lists 136 ad system lines, with 45 direct entries and 122 reseller entries, naming sales houses including Seedtag Advertising SL, PubPower, E-Planning (fka Teroa S.A.) - oRTB, Rich Audience Technologies SL and Smile Wanted Group.