Apache is a free and open-source cross-platform web server software.
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.
OsCommerce is an open-source ecommerce and online store-management software program.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.