ClustrMaps widget is a visitor tracker, designed for general web and blog use.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
LiteSpeed is a high-scalability web server.
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.
SoundCloud widget gives you the ability to upload, manage and share tracks.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.