Which free forum engine to choose?

Question

CMS

Hello, tell me which forum engine is the best at the moment?
By the best, I mean protection against hacking, the presence of important lotions of forums, the ability to change the design (it doesn’t matter).

Answer 1

simpleMachine is good.
If you redesign the design for yourself, it will be quite sweet;)

Answer 2

IPB

Answer 3

IPB 4