Wanderu: their website and free app let you search the itineraries of many of the biggest bus and train companies throughout North America and Europe to help you find the cheapest, shortest routes for your upcoming inter-city trip
GotoBus: An inter-city bus ticket booking platform offering affordable bus tickets. They provide over 7,500 bus schedules covering more than 350 destinations in North America and Europe.
Let's Skedaddle: a bus pooling technology that lets you build a bus route and let others who are interested in the same destination join in
Green Tortoise: a bus tour company that offers adventure trips across the US, including to Yosemite, the Grand Canyon, and Alaska! They also run two hostels, located in San Francisco and Seattle.
Warm Showers: "a free worldwide hospitality exchange for touring cyclists"
Bicycle Benefits: a nationwide program where cyclists can get discounts from businesses in their area by buying and displaying a sticker on their helmet
Bicycle Adventure Club: "a non-profit bicycle touring club for serious cyclists ... Members volunteer to create and lead a variety of bicycle tours, both domestic and foreign for each other."
Adventure Cycling Association: a non-profit organization with the mission to "inspire and empower people to travel by bicycle." They run a number of programs including guided tours and making cycling maps for the Adventure Cycling Route Network.
Turo: "Book unforgettable cars from local hosts around the world." Individuals can list their cars for rent with Turo and renters can choose the car they'd like based on the kind of car, cost, and location.
ZipCar: "the world's leading car sharing network. We give you on demand access to drive cars by the hour or the day in cities, airports, and campuses, around the globe."
Getaround: You can list your car on Getaround for travelers to rent out and for you to earn extra cash when you're not using your car!