Airwanderer would be something I have been looking for a long time but it does not seem to work so well. Also, is it just my browser or why is it so difficult to see the layovers? I have to click on "fight details" to see this. Why?

http://www.cleverlayover.com also never worked for me. Good idea, bad executed.

Regarding travel websites, you may want to check out:

https://www.kiwi.com Sometimes finds insane travel routes.

http://www.vayama.com Lets me sometimes stay in Ethiopia for free a day when I fly from Asia to Europe. Does not show up on any other website I consult.

I have also had luck at times with

http://www.opodo.com

http://www.expedia.com (yes, sometimes an old dog still does the trick)