Here’s a new and unique website if I’ve ever seen one. Flightfox is a platform for crowd-sourced (or human-powered) flight search. They describe crowd-sourcing as the act of multiple people helping you to do something. That means multiple flight experts search for your flights by hand but they won’t do it for free so you need to start a contest (commit a finder’s fee) and then their flight experts respond with the best flights they can find.
Of course, you can search for flights for free on other sites but what’s useful about FlightFox is that they are like me and claim to know some of the tricks to get cheaper flights and to figure out which one is best for you. It costs $29 to start a contest.