Papers helps you collect and curate your research material.

Public search engine and digital library for scientific and academic papers.

Aims to enable everyone to perform research.

A free, all-in-one online software platform for DNA design.

Google's mission is to organize the world's information and make it universally accessible and useful.

scite is a platform for discovering and evaluating scientific articles via Smart Citations. Smart Citations allow users to see how a scientific paper has been cited by providing the context of the citation and a classification describing whether it provides supporting or disputing evidence for the cited claim.

Online collaborative writing, citing, hosting of data and publishing.

Search metadata records for journal articles, field-specific, for software.

Article recommendation and literature discovery service in biology and medicine.

Mendeley is a desktop and web program produced by Elsevier for managing and sharing research papers, discovering research data and collaborating online.