event

An experimental variant of the standard worker MPM

itk

Allows to run each virtual host under a separate uid and gid

peruser

Peruser is a working implementation of the perchild MPM allowing to run each apache child process as its own user and group, each handling its own set of virtual hosts

prefork

Implements a non-threaded, pre-forking web server

worker

Multi-Processing Module implementing a hybrid multi-threaded multi-process web server