I will try to address your requests as best as I can.
1) There is a program call FL anti-cheat and should be found
here. It works by monitoring server load and when it reaches a set value them the players with traffic less than a set value will be kicked. It is based on the assumption that players with s-l-o-w connections lag the heck out of the server which can certainly be a cause but not always the only answer.
2) FLSO is the one and only admin program for all sysadmins. It is difficult to consider anything else standing up to it. I do use FLAcctBrowser and FLConnMon but they are helper programs to the master of all admin programs.
3) Define anti-cheat. To me a cheat is any breaking of the rules but not just modding. Certianly Pinger has it spot on pointing out that most of the anti-cheat is long hours, blearily searching files and assimilating data - all direct hands-on work. As for the modding cheats consider the FL v1.1 patch, Lancerguard and FLSO's banning after kicks.
Good luck!
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Earendil
SysAdmin of Boston Freelancer server
See
server rules and
server news for more info.