Altmetrics is an alternative way of measuring impact factors. These include views, downloads, bookmarks and presence in social media. Almetrics data is enabled in both IRIS and Library Search.
Research Impact & Visibility: Traditional and Altmetrics (Utrecht University Library) is a fantastic page that covers traditional and altmetrics, providing further details and tools for measuring impact factors.
Sites Offering Author Metrics
ResearchGate and Academia.edu both have their own analytics, which take a number of factors into account. However these metrics are limited in scope and have been criticised for their lack of transparency.