The Metrics Toolkit: a great introduction to Bibliometrics and Altmetrics with information about the benefits and drawbacks of different indicators
Scimago: a free service that provides a journal ranking metric
Altmetric: a great introduction to Altmetric , including appropriate usage and limitations of Altmetric indicators
IATUL Research Impact Things: a self-paced training program that covers a wide range of issues related to research impact
Bibliometrics
Bibliometrics refer to quantitative methods applied to research to demonstrate its impact. Watch the 'Bibliometrics in under 2 minutes' video below (from the University of Leeds) for a brief introduction. The two most common bibliographic indicators used are the citation counts an article receives and its H-index.
Bibliometric indicators can be applied at article, author or journal level. For example, H-index is an indicator linked to the author. For more information, read this introduction to author level metrics from Embry-Riddle Aeronautical University in Florida.
By contrast, journal level indicators refer to metrics such as Journal Impact Factor and Scimago Journal Rank. These measure the average number of citations an article receives over a given period.
Altmetrics
Altmetrics are research indicators that compliment traditional bibliographic indicators by monitoring and recording mentions of an item online in blogs and on things like Wikipedia and social media. Watch the 'Beginners guide to Altmetrics' video below, produced by Altmetric, for a brief introduction or click here for more information on altmetrics.