Adding an answer based on IATA’s COVID travel page. You can find the full text of the exemption on the IATA page, only adding the country names here for brevity.
Georgia. See the official government website of Georgia for additional reference.
Guatemala
Lebanon
Moldova
Belize
Ecuador
Montenegro
El Salvador
Eritrea
Maldives
Bahamas
Antigua and Barbuda
Iceland. The official Icelandic page on border control includes a very detailed description of what’s acceptable.
Kosovo
Turks and Caicos
Uruguay
UAE
Jordan
Uganda
Zambia
Germany (From June 25, 2021; Not applicable to travelers coming from areas flagged as areas of variant of concern by the German RKI)
Israel
Turkmenistan
Qatar
Serbia
Kuwait
Sri Lanka
Hong Kong
South Korea
Turkey
Samoa
Saudi Arabia
Uruguay
Any official vaccination certificates seem to be acceptable, as long as vaccinations from your nation are recognized by the country you are entering. I.e. Iceland accepts the US-issued CDC vaccine certificates.
thepointsguy.com provides a list of countries that have a vaccination passport, as well as details for each country as to what the vaccination passport allows:
Credit:stackoverflow.com‘
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