Apache is a free and open-source cross-platform web server software.
Mailchimp is a marketing automation platform and email marketing service.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
Skimlinks is a content monetization platform for online publishers.
StackPath is a cloud computing and services provider.