Any good and useful tools that native Ubuntu doesn’t have?

I always loved exploring veriexec

https://netbsd.org/docs/guide/en/chap-veriexec.html

I'm sure by now ubuntu has a 1/4-baked similar implementation because teenage rebellion

Yeah, but that relies on a kernel-feature(of NetBSD).

Doesn't come over with a port of just some userland(utilities).