Try to list what you will use it for, to give you better advice.NoFan95
should handle almost any CPU and its fanless, but its big and will require a big mini ITX case, the cpu socket position is important, and a motherboard that doesnt have any extra things on the back to mount it, maybe something like Lian Li Q07 + PicoPSU (you do need to crosscheck if it would fit).
There are other options like HDPLEX H3.SODD Fanless Mini-ITX HTPC
Case that might fit more into what you are looking as long as its not a high TDP CPU, there are other options from other companies if you are interested.
Btw to what i have read the NUC is not fanless, has a slot blower on the bottom, weather its noisy or not idk, but since you are searching for a true fanless that shouldnt qualify, but this was on ivy bridge, not sure on haswell nucs.