As an alternative to using impact factors from the Journal Citation Reports, a lot of new sites have cropped up on the Internet using other metrics. While the metrics are different, two of the sites are still using journals only listed in the JCR.
Metrics for journal rankings defined by content in Google Scholar.Use the pull-down menu to find broad subject categories and then within those subdisciplines with journal title rankings by h5 indices.
The SCImago Journal & Country Rank includes the journals and country scientific indicators developed from the information contained in the Scopus database. It includes two metrics: SCImago Journal Rank (SJR) and Source Normalized Impact per Paper (SNIP). SJR is based on times cited, but also uses an algorithm to calculate article influence, which it uses to create rankings.