Online resources: is there any place to get the "visa requirements for holders of an X visa" or something like that?

When searching for visa requirements, the Wikipedia pages for "Visa requirements for citizens X" and "Y visa policy" (where X is your country and Y is the country you want to visit) are quite useful. However, is there any place where consolidated information is provided on which countries allow certain visa holders to enter without needing to obtain a separate visa? As an example, Romania is not currently part of the Schengen Area, but it does allow multiple entry Schengen visa holders or residents of Schengen countries, regardless of their nationality, to visit Romania for a limited time. Those who have a valid United States visa can also visit Mexico without an additional visa, for another example.