PivotX is free software to help you maintain dynamic sites such as weblogs, online journals and other frequently updated websites in general. It's written in PHP and uses MySQL or flat files as a database.

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.

OpenUI5 is an open source JavaScript UI library, maintained by SAP and available under the Apache 2.0 license.

li3 (formerly lithium) is a full-stack web framework, for producing web applications.

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

Vue.js is an open-source progressive JavaScript framework for building user interfaces.

Cappuccino is an open source application framework for developing applications that look and feel like the desktop software users are familiar with.

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

JSP Hosting on Linux Servers.

dotCMS is an open source content management system (CMS) written in Java for managing content and content driven sites and applications.

Adult Java Hosting packages 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.

OpenKM is a Free/Libre document management system that provides a web interface for managing arbitrary files.

Hippo CMS is an open-source, dual licensed, Content Management System.

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".

Ametys is a free and open source content management system (CMS) written in Java.