Create an application(can be a fake application), it should have a web based login where users are needed to input password, admin back end should verify account. It must have the folllowing 3 conditions:a)allow registration-user password b) verification must be emaisent to user who then clicks a link in email to verify *** cannot login unless verification happens c)Administration page- list of all users, the ability to delete users It does not matter what distribution is used. and I will be working on CentOS 7
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If you are looking to create the web app yourself, I will recommend looking into Frameworks such as Yii, Zend for PHP or Django with Python. Most web frameworks have user management built-in and it is easy to implement it to your application.
You can also use content management systems such as WordPress and Drupal.
DigitalOcean has one click installs for WordPress and Drupal: https://www.digitalocean.com/community/tutorials/how-to-use-the-wordpress-one-click-install-on-digitalocean