Kayak.com: This great search engine will trawl through hotels, flights and car rental firms to find the best available prices.
Hostelworld.com: Book hundreds of user-rated hostels around the globe in different currencies.
Airbnb.com: Search thousands of properties worldwide, and get a fresh approach to travelling by staying with a local.
Couchsurfing.com: Stay for free on someone’s sofa. Just create an online account and become a member of the couchsurfing community.