Carma: The Carma Carpooling app enables drivers to find people going their way to share the costs of the journey and reduce traffic and emissions. Marketed to regular commuters, available in about a dozen cities. carmacarpool.com
Car2Go: A subsidiary of Daimler AG, Car2Go makes Smart Fortwos and other small vehicles available for short-term rental in selected U.S., Canadian, and European cities. car2go.com
Flywheel: A mobile app for the taxi industry that connects passengers with licensed drivers. Flywheel allows passengers to order taxi rides in real-time, track arrival via GPS and automatically pay fares via their mobile device. Partners with licensed cab drivers and fleets. flywheel.com
Lyft: An app-based ride-hailing service similar to Uber with more casual branding and no premium service. Contract employees use their own cars. Mainly based in major U.S. cities. lyft.com
Relay Rides: Enables owners to rent their cars from their driveways or deliver them to airports for pickup.
relayrides.com
RideAmigos: A trip planner that aggregates all modes of transportation for a given region, including ridesharing, vanpooling, transit, bus, biking and walking. Compares time, distance, cost and carbon footprint of each mode. Rewards users for socially responsible behavior. Marketed to corporations, governments, schools and transportation authorities. rideamigos.com
RideScout: Mobile app that displays several mobility options at once. Enables travelers to compare rides by cost, type, and expected trip time. ridescoutapp.com
Sidecar: Offers three ridesharing options: Sidecar, an app which connects riders with everyday drivers in their personal vehicles; Sidecar Shared Rides, a discounted instant carpooling app; and Sidecar Deliveries, which pairs packages with passengers for local deliveries. side.cr
Uber: The original mainstream private ride-hailing service. Offers low-cost UberX, limo-style “Black” service, and “SUV” service. Available in hundreds of cities worldwide, with a market cap that has topped $40 billion. uber.com