A wiki is a website which allows collaborative modification of its content and structure directly from the web browser. In a typical wiki, text is written using a simplified markup language (known as "wiki markup"), and often edited with the help of a rich-text editor.
A blog (a truncation of the expression weblog)[1] is a discussion or informational site published on the World Wide Web consisting of discrete entries ("posts") typically displayed in reverse chronological order (the most recent post appears first).
A mailing list is a collection of names and addresses used by an individual or an organization to send material to multiple recipients. The term is often extended to include the people subscribed to such a list, so the group of subscribers is referred to as "the mailing list", or simply "the list".
MediaWiki is a free and open-source wiki application. It was originally developed by the Wikimedia Foundation and runs on many websites, including Wikipedia, Wiktionary and Wikimedia Commons. It is written in the PHP programming language and uses a backend database.
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DokuWiki is a wiki application licensed under GPL 2 and written in the PHP programming language. It works on plain text files and thus does not need a database. Its syntax is similar to the one used by MediaWiki.
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WordPress is a free and open-source content management system (CMS) based on PHP and MySQL. Features include a plugin architecture and a template system. WordPress was used by more than 23.3% of the top 10 million websites as of January 2015. WordPress is the most popular blogging system in use on the Web, at more than 60 million websites.
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Publify is a simple but full featured web publishing software. It's built around a blogging engine and a small message system connected to Twitter. Publify follows the principles of the IndieWeb, which are self hosting your Web site, and Publish On your Own Site, Syndicate Everywhere. Publify has been around since 2004 and is the oldest Ruby on Rails open source project alive.
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Chyrp is a free and open source blog publishing application, developed by Alex Suraci. Chyrp is intended to be light-weight, yet functional.
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Ghost is a simple, powerful publishing platform that allows you to share your stories with the world.
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phpList is an open source software for managing mailing lists. It is designed for the dissemination of information, such as newsletters, news, advertising to list of subscribers. It is written in PHP and uses a MySQL database to store the information.
B - Please note that phpList has additional costs for mail volume