Episerver offers many options for extending solutions through different APIs, add-on applications, and code contributions. Add-ons are extensions developed by Episerver and partners. Some are verified within the Episerver Add-on Program and others are available as open source.
Most integrations involve subscribing to a service, and/or installation of NuGet packages in Visual Studio. Configuration and APIs are described in developer guides, see each integration. See platform integration compatibility for supported product versions for different integrations.