Apache is a free and open-source cross-platform web server software.
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.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.
VDX.tv (formerly Exponential) is a global advertising technology company that is transforming the way brands connect with relevant audiences in today's converging video landscape.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.