There are free WordPress plugins and there are WordPress plugins that you must pay for. These are often called “premium” WordPress plugins. Free plugins can be found in the official plugin directory on WordPress.org, but premium WordPress plugins are not likely to ever be listed here. So how can premium plugins be found then?
The WordPress Plugin Directory is due for an update. While it’s great for getting information about specific plugins, it’s not so great for browsing. The lack of filtering, and the poor quality of relevance results are two of the main reasons. I’m proposing a revamp of the plugin directory.