Apache is a free and open-source cross-platform web server software.
CentOS is a Linux distribution that provides a free, community-supported computing platform functionally compatible with its upstream source, Red Hat Enterprise Linux (RHEL).
Google Analytics is a free web analytics service that tracks and reports website traffic.
SoundCloud widget gives you the ability to upload, manage and share tracks.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.