This mod removes all level requirements from all Perks in Fallout 4 (updated to latest DLC, Nuka Cola). I had previously used Perks Unleashed, but it seems broken with how the latest DLC handles additional perks.

Original link to Perks Unleashed:
http://www.nexusmods.com/fallout4/mods/2986/?

I am the original author of the Perk level stripping mod for New Vegas:
http://www.nexusmods.com/newvegas/mods/35093/?