Human Rights Search Engine
If your researches take you into the area of human rights, you might want to avail yourself of a relatively new topical search engine, HuriSearch. One of the projects of the interesting HuriDocs, HuriSearch offers you a fairly sophisticated front end, allowing you to query any of four types of source (NGOs, national human rights institutions, academic institutions, and intergovernmental organizations), search in any of sixteen languages, and use word variations if you wish. As well, search results can be filtered by facets: source type, source organization, country, and document format.
Better yet, you're offered a permalink to your search and an RSS feed, so that you can stay up-to-date.
HuriDocs, the parent organization, is worth a post all by itself, something I'll try to get to in the coming days. I'm particularly interested in their newly launched Case Law Analyser, brought to bear currently on a collection of African human rights decisions.