vhostManager is utility from managing configuration of virtual hosts for enterprise distributed solutions with many wirtual hosts and many server aliases. The best example is JSP hosting platform with farm of Tomcat/Jetty servers connected with Apache HTTPD using AJP (mod_jk). vhostManager helps create and manage virtual hosts (adding/removing aliases) without modyfing httpd.conf file. It's comand line application so you can use it with scripts and other applications.