The Addon Manager shows a detailed list of all addons (plugins, behaviors, effects and themes) available in Construct 3. It can be opened via Menu►View►Addon Manager.

By default built-in addons are included in the list. Third-party addons appear at the top so you can easily see what you have installed. You can also uncheck Show built-in in the toolbar to reduce the list to only your installed addons. The search field also allows filtering the list to help you find an addon.

You can find a list of third-party addons on the Addon Exchange on the construct.net website. See Installing third-party addons for more information about how to install and uninstall additional addons.

Third-party addons can be bundled with projects Paid plans only, so you don't need to install all the addons it uses when moving to a different system. For more information, see the Bundle addons project property.