AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.
Apache is a free and open-source cross-platform web server software.
AWeber is an email marketing service.
Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.
Lightbox is small javascript library used to overlay images on top of the current page.
PHP is a general-purpose scripting language used for web development.