I've built a multi-hop flight router that I always wanted to have for planning my vacations. It's free to use and it offers a button to search for plane tickets (with affiliation, but no obligation to use it obviously). No accounts, no tracking.

You can - find routes - from A to B - from A to all airports around a pin on the map (max 5 closest) - visualize alternatives - add stopovers (max 8) - add layovers to avoid - share itinerary - search for tickets (link to kiwi.com with prefilled parameters)

Try it out ;)