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

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

Aims to enable everyone to perform research.

Papers helps you collect and curate your research material.

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

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

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.

An online reference management tool that collects, manages to refer associated PDFs

Citation management software program for Mac and Windows.

Reference management and knowledge organization.