Computer Science Rankings (beta) was developed and is maintained by Emery Berger, a CS Professor from the University of Massachusetts Amherst.
According to the website, "Currently, this database includes US and selected Canadian and European CS or EECS departments (or equivalent); other institutions will be added in the near future." The rankings are based on counts of papers published in top venues in a specific research area. For example, the rankings consider three top conferences in software engineering: ASE, FSE, ICSE.
The website allows to produce rankings for all CS areas or for a specific CS area.
As of August 14, 2016, the Top 5 CS departments ranked in the website across all CS areas remain the same as the ones in the US News. In other words, Illinois CS is ranked No. 5. Here is the archived snapshot of the ranking shown on the website.
When considering only the software engineering area, Illinois CS is ranked No. 1. Here is the archived snapshot of the ranking shown on the website.