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20. Skyscanner
Skyscanner is an excellent money-saving app, where it aggregates all the available flights into one spot and promises the cheapest rates. But while it helps you find the cheapest flights, it also has a bunch of other neat features that can potentially save you hundreds. 

First, there is the "month view" feature, which lets you see all the different rates by day. So if you don't care what particular day you leave, you can just pick and choose the cheapest fares and cobble your trip that way. 

There is also the "everywhere" feature, where you can ask to see a list of the cheapest destinations for a particular month. So if you're not fussy about where you go on vacation - and you know you just want to go somewhere new - this is a great, budget-friendly way to pick it.