Released under the GNU General Public License version 2.0 (GPLv2), phpList is one of the most popular open source newsletter softwar which helps you to manage email campaigns. It is written in the programming language ‘php’, and it is used to disseminate information to a large number of subscribers. phplist is designed to manage mailing lists with hundreds of thousands of subscribers. It tracks links and URLs. Statistics can be viewed by message, URL or subscriber.