mod_apache
Create individual virtualhost files for every website, giving a clearly system. Every virtualhost could active or deactivate, php safe mode, php openbasedir, cgi-bin support, indexes apache support, and you could add more alias.
mod_awstats
Configure and individual awstats file for every domain, and give individual password access to see stadistics.
mod_bandwidth
Give a measure of apache consume every day, and you can see all stadistics every day and every month.
mod_bind
Create dns files for every domain. After you can modify manually in the panel, the configuration.
mod_db_mysql
Create databases, with permisions users, and give a measure of mysql quota for every database.
mod_logrotate
Only add the apache log, to rotate every day, no more 2 gb files, and apache inode hangs.
mod_procesos
You can view all system process with this.
mod_pureftpd
The best ftp server, with MySQL an virtual users support. No more sytem users. Quota support and measure.
mod_sysinfo
Give some information about the machine.
mod_vpopmail
Support to create email domains and create accounts.