My personal favorite one is Old World ENB. There's also performance dynamo enb but my antivirus keeps saying there's something sketchy about it. Sadly, when I bought a bigger monitor, I could no longer run it at a stable fps. Even though I'm a console player at heart and am used to 30fps, it is a bit of a bummer that I can't run it smoothly anymore.
"A drop in the Basket, Is Worth a Shepherd's Shilling" ~ Danka Chevchnov