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.
PHP is a general-purpose scripting language used for web development.
TinyMCE is an online rich-text editor released as open-source software. TinyMCE is designed to integrate with JavaScript libraries, Vue.js, and AngularJS as well as content management systems such as Joomla!, and WordPress.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.