"CORE aims to facilitate free access to content stored across Open Access repositories. CORE is a large aggregator of content (several million publications from hundreds of Open Access repositories) on top of which value added services are provided. CORE offers five applications:
• CORE Portal - Allows to search and navigate scientific publications aggregated from a wide range of Open Access Repositories (OARs)
• CORE Mobile - An Android application that enables you to search and download open access articles.
• CORE Plugin - A Plugin to Open Access repositories that enables them to search for related scientific publications.
• CORE API - Enables external systems and services to interact with the CORE repository.
• Repository Analytics - A tool that enables to monitor the ingestion of metadata and content from repositories and provides a wide range of statistics."
from source: http://core-project.kmi.open.ac.uk/about-core