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WonderCMS is a completely free open source Content Management System, or in other words, a free website builder.

qooxdoo is a universal JavaScript framework with a coherent set of individual components and a powerful toolchain.

CodeIgniter is an open-source software rapid development web framework, for use in building dynamic web sites with PHP.

QUnit is a powerful, easy-to-use JavaScript unit testing framework.

PDF.js or pdf.js is a JavaScript library intended to render PDF files using the HTML5 Canvas for a safer and web standards compliant web browser rendering of PDF files.

Backbone.js is a JavaScript library with a RESTful JSON interface and is based on the model–view–presenter (MVP) application design paradigm.

Grav is a Fast, Simple, and Flexible file-based Web-platform. Although Grav follows principles similar to other flat-file CMS platforms, it has a different design philosophy than most. The underlying architecture of Grav is built using well established and best-in-class technologies.

Python Hosting on Linux Servers

XWiki is a free wiki software platform written in Java with a design emphasis on extensibility.

Google Web Toolkit, or GWT Web Toolkit, is an open source set of tools that allows web developers to create and maintain complex JavaScript front-end applications in Java.

Tomcat Hosting on Linux Servers.

JSP Hosting on Linux Servers.

OpenWGA is Web Content Management computer software running on the Java Enterprise Edition Platform.

LogicalDOC is a free document management system that is designed to handle and share documents within an organization.

eXo Platform is an open source, standard-based, Enterprise Social Collaboration Platform written in Java.

Magnolia is an open-source digital business platform with a content management system (CMS) at its core.

Apache Roller is a Java-based Open Source "full-featured, Multi-blog, Multi-user, and group-blog server suitable for blog sites large and small".