Apache provides a module to see the server-status. However the page is not too good looking. So, if you want to see a better looking information page, then you can download :
http://sourceforge.net/projects/pimpapachestat/
More details from the readme file of the project:
REQUIREMENTS
On the system you want to install the pimped Apache status:
– any webserver with php 5 (with curl; no database is needed) On all webservers you want to monitor:
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