Google Scholar - Google Scholar is a freely accessible web search engine that indexes the full text of scholarly...
Academus - Read research papers as interactive webpages
elicit - elicit is an on-site search software for internet, mobile devices and social media.
Localingual - Listen to the voices of the world
SemanticScholar - An academic search engine that utilizes artificial intelligence methods to provide highly relevant results and novel tools to filter them with ease.
FlashTabs - Flashcards in your new tab screen