Commentpress is a theme and plugin for WordPress that enables granular public commenting on texts.

Exhibit 3.0 is a publishing framework for large scale data-rich interactive Web pages. The beta version is scalable up to 100k items.

HUBzero is a web publication platform intended for research software and educational materials. HUBzero's most distinctive traits are a built-in environment that can run software that scholars have developed within the browser, a tool development area, the ability to post web-based presentations associated with tools.

Open Conference Systems (OCS) is a tool that allows users to create a conference website, send a call for papers, accept paper and abstract submissions, post conference proceedings and data sets, register participants, and enable post-conference online discussion.

TXM is a free and open-source cross-platform Unicode, XML & TEI based text/corpus analysis environment and graphical client, supporting Windows, Linux and Mac OS X. It can also be used online as a J2EE standard compliant web portal (GWT based) with access control built in.

Wordpress.com provides free ad-supported hosting for basic WordPress sites, with paid options for premium features (custom domain, extra storage, custom design, no ads, etc.)