Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
HubSpot is a marketing and sales software that helps companies attract visitors, convert leads, and close customers.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Wistia is designed exclusively to serve companies using video on their websites for marketing, support, and sales.