Did you mean to access Concrete5? Click on the following link.

localhost / Concrete5 CMS

Concrete5 is a flexible content management system (CMS) and robust framework.

Or try:

http://localhost:80/concrete5
http://localhost:8080/concrete5

Concrete5 is an open-source content management system (CMS) that runs on a web server. Concrete5 is designed for ease of use, for users with a minimum of technical skills. With concrete5, site owners will be able to make changes and additions on their own.