Begun in 2012 and funded by the German Research Foundation (DFG), re3data.org - which stands for the Registry of Research Data Repositories - is a global registry of research data repositories. Data is not stored on re3data.org. Rather, users search re3data.org to find repositories that match up with their interests, either to find data sets, or find a place to store their own data sets.
Besides a traditional search option, re3data.org has three browse options: by subject, by content type, and by country. Re3data.org has powerful visual elements for their browse by subject and browse by country options. The browse by subject option shows a colorful wheel that allows you to move between disciplines and sub-disciplines to search for repositories. The browse by country option is a world map. Be warned, however: while some places are represented in these visual elements, they may have zero, or very few, repositories attached to them. Pictured below is the browse by subject wheel.