Ipban_XH facilitates to block access to your site from individual IP addresses. If a user is banned this way, he'll receives an appropriate message. To make the selection of offending IPs somewhat easier, all POST requests to the site are logged.
If you're looking for a more general solution to the problem of spammers and request flooding have a look at GXSecurity.
It requires a UTF-8 encoded CMSimple_XH installation and jQuery4CMSimple. It is released under GPLv3.
Ipban_XH couldn't be tested so far in various environments. It is a so called BETA version. Use with caution!
For use with hi_updatecheck a version info file is available: