Which affiliate program is great for people who don't have a website and works in any country?

Quite generic, depends on what is it that you want to sell. Basic strategy is same when ever you are doing affiliate marketing, 

1 - footfall/ eyeballs related to your product/service available on site/location

2 - historical trends numbers

3 - funnel step in customer journey

4 - your budget allocation

with a mix of sugar, spice and everything nice you can create a perfect mix.