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.
cdnjs is a free distributed JS library delivery service.
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.
SPIP is a content management system written in PHP that uses one or more databases like SQL, SQLite or PostgreSQL.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.