Fleet X - Car rental management software
Getaround - Instantly rent cars near you. Rent nearby cars, trucks, and vans, by the hour or day.
Silvercar - Car rental that doesn't suck
Turo - Turo is a peer-to-peer (P2P) car sharing marketplace where you can easily book any car you want, wherever you want it.
Vinty - Online marketplace for classic car rentals
ZipCar - ZipCar is a free mobile app that connects you with rental vehicles just about anywhere in the world. You can instantly reserve a vehicle, and even unlock it directly from the app.