Err, well all the undetected crossfire hacks are on this page: CrossFire Hacks - MPGH - MultiPlayer Game Hacking
(Scroll down half past the page)
All injectors are found here: CrossFire Spammers, Injectors and Multi Tools - MPGH - MultiPlayer Game Hacking
Anything released at it's latest is what you should use.
I use Blue Dragon Injector v1.3, when I test hacks.