WordPress is great for multi-users and for creating blog sites. But what if you want to monetize it so you can charge for subscriptions? There are some plugins available, this one we found to be not only free, but fully featured.
Of all the ones tested, this was the most complete out-of-the-box, and had the most documentation, with over 50 help videos. The documentation is excellent, but I found the first few steps to be time consuming with trial and error. Here is a quick-start guide to s2Member: