Back in February, the UN Statistics Division released their beta system for providing a single entry point for UN data. This new system replaces the UN Common Databse (UNCDB), with which many readers will be familiar.
Undata allows you to search for data by keyword as well as browse by category. It is regularly updated and pulls data from across the UN. As of this post, it searches 55 million records of data sources.
Read more about it on the undata wiki.