The best source for information about what clearances the destination country may require is usually someone in that country. Your recipient may know, or may have access to knowledgeable resources.
It may be helpful for the recipient to line up a customs broker to clear the shipment through Customs in the destination country. You'll need to designate this broker in the shipping paperwork.
Export.gov has a high-level summary of Foreign Standard and Certification Information.
FedEx has very detailed Country Profiles
The European Union Export Helpdesk has information about EU tariffs and requirements
Countries may have a useful web page — Google "<countryname> import" and look for a government link. A few examples:
Page updated: September 6, 2017