Worldpackers is a different type of travel site that aims to help backpackers market their skills to hostel owners around the world. Instead of simply showing you the best rates, the site connects you to hostels in need of your talents. "Skills" include everything from tending bar to community work and teaching. In exchange for your work, the hostels offer free room and occasionally some food and cash.
Anyone who has ever stayed in a hostel has likely wondered about the expat staff working there. Worldpackers gives you the chance to be that staff, all from the comfort of your couch at home. While the hostels won't pay for your flight or get your visa, you do have the chance to work and engage in a cultural exchange wherever you stay. Saving money on room and potentially board is nice as well.