I put this list of country-specific search engines together a few months ago to spite someone who was charging $700 for, essentially, this list. I posted it here a few months ago, but thought it might be appreciated again. (Updated July 2022)
Belgium – https://www.studyinflanders.be
Germany – https://www.daad.de/en/
Sweden – https://studyinsweden.se/
The Netherlands – https://www.studyinholland.nl/
Italy – https://studyinitaly.esteri.it/en/home_borse
Norway – https://www.studyinnorway.no/
Finland – https://www.studyinfinland.fi/
Denmark – https://studyindenmark.dk/
Spain – http://www.spainedu.org/
France – https://www.campusfrance.org/en
UK – https://www.ucas.com
Australia – https://www.courseseeker.edu.au/
Canada – https://www.universitystudy.ca/about-us/
New Zealand – https://www.universitiesnz.ac.nz/universities
Ireland – https://www.gov.ie/en/service/colleges-and-universities-in-ireland/
Japan – https://www.studyinjapan.go.jp/en/planning/search-school/daigakukensaku/
Israel – https://en.study.co.il/