Covalent Enterprise Ready Server By Covalent Division of SpringSource Inc.

Covalent Enterprise Ready Server™ (ERS) is the first comprehensive enterprise solution for Apache server management and the most widely distributed Web infrastructure stack in Fortune 500 enterprises. It improves service quality and provides heightened security by uniquely enhancing Apache for enterprise use.
ERS includes the following open source components:
Apache HTTP 1.3, 2.0 & 2.2
Apache Tomcat 4.1, 5, & 5.5 Java servers
FTP
SNMP
Proxy support
mod_cache
And more than 50 other Apache modules