The term altmetrics refers to new, alternative ways of assessing the impact of authors and publications. It presumes that value can be assessed by counting online shares, saves, reviews, adaptations and mentions. Altmetrics take into account a variety of research products, including gray literature; research blogs; data sets; citation managers, like Mendeley; and social media, such as Facebook and Twitter
ImpactStory -- Funded by the National Science Foundation and the Alfred P. Sloan Foundation, ImpactStory is an open-source, web-based tool that tracks the impacts of altmetrics, including blog posts, datasets, and software as well journal articles. It aggregates data from many sources and creates a report.
Plum Analytics (Elsevier) -- Plum Analytics tracks journal articles, books, videos, presentations, conference proceedings, datasets, source code, cases and more.
PLoS Article-Level Metrics -- Article-level metrics are available, upon publication, for every article published by PLOS.