The taxi and limousine industry is worth $11 billion a year in the United States alone, and the competition is fierce among companies creating technology that connects riders with drivers. The biggest players all seem to have something in common with Uber. And so do companies in some other industries.

Hailo

The Twist: It's like Uber, but just for cabs.

Signature Move: Playing nice with municipalities; winning over cabdrivers.

Lyft

The Twist: It's like Uber, but the drivers aren't professionals.

Signature Move: Drivers fist-bump passengers; the cars have pink moustaches on the grilles.

Sidecar

The Twist: It's like Uber, but the fares are technically donations, and the drivers aren't professionals.

Signature Move: Claiming the moral high ground--using Sidecar is all about easing carpooling and getting vehicles off the road.

BlackJet

The Twist: It's like Uber, but for airplanes.

Signature Move: Welcome to 2013: You can book a private jet with your smartphone.

Swifto

The Twist: It's like Uber, but for dog walking.

Signature Move: Actually pitching the company as "Uber for dog walking."