ESI is a subscription database which uses Web of Science citation data to rank scientists, institutions, countries, journals and papers. You can Search & Sort results by Name or Field. On the Web of Knowledge 'Additional Resources' tab.
World University rankings
Some of the major international rankings, all freely available:
Produced by Shanghai Jiao Tong University. Covers 500 universities. Uses Web of Science data plus factors such as winners of Nobel Prize and Fields Medal.
By the Cybermetrics Lab of the Spanish National Research Council (CSIC). Based on web presence and impact, using link analysis not citation analysis. Covers 20,000 universities.
Produced by the National Taiwan University, the Performance Ranking of Scientific Papers for World Universities provides world University rankings across 6 fields and 27 subjects.