John Marino has added support for RELRO in DragonFly, which makes it the first BSD to have it. That’s great news! What is it? Apparently a guard against memory corruption or overflow in the linker. His commit message gives better details.
A running description of activity related to DragonFly BSD.
If you want to score another first time in *BSD (heck, IIRC even Linux doesn’t have it), add CTR support to the padlock kernel driver :)