Altmetric.com -- A UK-based company that offers altmetrics services for institutions and researchers. The free Altmetric bookmarklet provides article-level matrics.
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.