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With over 2 million users, Poparide provides the biggest, most reliable and safest rideshare app for city-to-city trips in North America. Save money, make new friends and reduce your carbon footprint. Free signup!

一个专属于程序员的平台，为大家在漫漫的刷题之旅中，提供最优质的解答

The internet's icon library + toolkit. Used by millions of designers, devs, & content creators. Open-source. Always free. Always awesome.

JSTOR is a digital library of academic journals, books, and primary sources.

openDemocracy is an independent international media platform covering news, ideas and culture which seeks to challenge power and encourage democratic debate.

404 Media is an independent media company founded by technology journalists Jason Koebler, Emanuel Maiberg, Samantha Cole, and Joseph Cox.

U.S. Department of Commerce

Presentations for the classroom in a unique timeline format. On Sutori, teachers and students create a variety of projects, assignments and portfolios. Perfect for the flipped classroom and collaborative work, Sutori

The easiest way to blog. Turn an Evernote notebook into a beautiful blog or web site.

Get to the source. Specialized knowledge on any topic, and answers you won’t find anywhere else. Home to the world’s documents, 300M+ and counting.