With a simple memory search and modification tool, anyone can "hack" JJ2 and even make a trainer\cheat program without even having to know how to program (thanks to the trainer making programs).

Majority of the programs I have seen are less than useless. In my opinion, few people have released helpful hacks\programs and those that I know of include Link (Chatlog JJ2 among many others), Spaztic (Debug Launcher, Quick Cheat and Name\Server Editor), Aiko (JazzEd), Eagle (Project Gamma), Overlord (Cataclysm and a LOT more), pennywise (XJJ2), Cheeze (jj2srvinfo) and Spazzyman (Jazz2 ServerScan). Kaz and Mez did some really cool (unreleased) stuff as well.

What other people have to say about some of the aforementioned programs (there are also links to the programs and the complete comments):

"JazzEd does what it promises, and proves to be quite useful..." ~Derby on JazzEd (The local censorhorse gave this a 10!)

"An extremely usefull program for people who like hosting CTF (like me, for instance). It does what it’s suposed to do flawlessly, and can be very usefull for things like JDC, so admins won’t have to shout at everyone that they have to bleach their names..." >CelL< on Project Gamma

"Cataclysm is simply the best server maintnence tool you can find today. If your server has ever had a cheating problem, then set this program up and leave your computer. You need not worry that your server has quietly crashed or turned into a chaotic spree of cheating while you are gone..." ~Trafton on Cataclysm

"This is the most useful tool I’ve ever seen for JJ2. Thank you Cheeze, for making this " ~Link on jj2srvinfo

"Very nice program here. It’s like JazzTool, except you are not able to lag people with it purposely, and you don’t get to know who is in the server. Also, it doesn’t crash constantly..." ~Labratkid on Jazz2 ServerScan