AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.
AWeber is an email marketing service.
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.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
React is an open-source JavaScript library for building user interfaces or UI components.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.