15 companies that will change the world

These game-changing startups are likely to upend existing industries - and spawn new entrepreneurial opportunities.

Zipcar
Zipcar's Griffith is turning self-serve auto rental into a viable alternative to car ownership.
Zipcar
CEO: Scott Griffith
Disruption: Self-serve hourly car rental in urban neighborhoods
Disrupted: Car dealers and traditional rental agencies

There are no service clerks, no paper contracts, no lines. With Zipcar, you pay a $50 annual membership, then go online to see what cars are available near you. When you get to the car, swipe your wireless ID card to get in, and the keys are inside. You pay a usage fee that runs $8 to $15 per hour. Zipcar is profitable in cities where it has been operating more than two years, including Boston, New York, San Francisco and Washington, D.C., and it's ahead of competitors like Flexcar and City CarShare.

Not your typical rental

Blinkx

Raydiance

Expensr

Zipcar

MFG.com

Virgin Charter

PatientsLikeMe

Bloom Energy

Vanu

Zink

A123 Systems

Renewable Energy Group

Desktop Factory

Cree

One laptop per child
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Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.