Page views and downloads are considered 'emerging metrics', but are quickly gaining acceptance, particularly as an early indicator of impact for articles.
These metrics are sometimes available from individual publishers, including PLoS, Taylor & Francis, and Elsevier.
Research networks including SSRN, ResearchGate, academia.edu and Mendeley also offer readership and/or download metrics.
Web of Science tracks Usage Counts, similar to an article download, back to 2013 for its articles as well
Institutional repositories, including our own repository, also tracks these metrics. See here for more details on our repository, or contact Rachel Borchardt, the digital repository coordinator, directly for more information.