We call it SimSu.

The Simple Subscription Manager, that works with Joomla, Community Builder, JomSocial and more.
You can force users to first subscribe to a plan, pay for it and then allow them to access your site as registered users.

Product Highlights:

- Joomla 1.5 native extension.

- No hacking and joomla remains easily upgradable.

- Even visitors can buy/subscribe. No need to register first.

- Unlimited number of Subscription Plans with flexible plan durations. Lifetime, yearly, monthly, weekly, daily and hourly. You can also define a frequency with period type. Like 3 months or 10 days etc.

- As it is a native Joomla 1.5 extension, it can simply be installed/uninstalled.

- Simple and effective component for JomSocial paid membership / subscription, Joomla subscription and Community Builder (CB) Subscription.

Please visit us to know more....