The Matomo (Piwik) Marketplace is an open Marketplace for Matomo plugins. It is a place where companies, developers and enthusiasts can freely share with everyone their Matomo plugins. The Marketplace is not controlled by a private entity and plugins don’t have to be pre-approved to be displayed: the Matomo Marketplace is open. Of course there are rules that Plugins developers must follow to publish their plugins in the Marketplace.
In other words: the Matomo (Piwik) Marketplace is the equivalent for Matomo to what Google Play is to Android phones, or what App Store is to Apple iOS devices.
Browse the Matomo (Piwik) Marketplace at: plugins.matomo.org