Academic Search Engines
SweetSearch is A Search Engine for Students. It searches only credible Web sites approved by Internet research experts.
RefSeek is a web search engine for students and researchers that aims to make academic information easily accessible to everyone.
The first multidisciplinary aggregator of Open Access journals and papers. Keep on top of recent discoveries and never hit a paywall.
ScienceOpen is a freely accessible research network to discover and evaluate scientific information. Search among over 27 million articles and article records, filter by citation or Altmetric score, and share your expertise via comments or peer review.