Passport Index – World's passports in one place
passportindex.org
passportindex.org
Here I'll leave it to others whether this is smart and laudable or sneaky and regrettable. Perhaps it's normal and unremarkable, but I find it interesting. It is only a guess on my part that this is intentional and coordinated.
"Passports are ranked based on their Visa Free Score. The higher the Visa Free Score, the better the Passport Power Rank."
Edit: I presume this is the number of countries which a holder of a certain passport can visit without needing a visa.
In this case, the power ranking might involve some sort of Google search type of algorithm, where the "desirability" of the country is weighted by how many countries its passport holders can visit (we're assuming that the countries enter these sorts of visitation agreements based on political stability, trade agreements, tourism motivations, etc)
In addition, you'd probably want to factor in a more detailed breakdown of visa restrictions, difficulties to obtain visas to various countries, etc.