Halo

Halo is a modern open-source content management system written in Java. It provides a flexible platform for creating blogs, corporate websites, and community forums. The system supports Markdown editing, multi-language content, and customizable themes, making it suitable for both personal and professional use. Halo’s plugin architecture allows developers to extend its core functionality with custom modules.

Halo runs on any system with Java 17 or later, including Linux, Windows, and macOS. It integrates with MySQL, PostgreSQL, and H2 databases, and offers RESTful APIs for headless CMS scenarios. The default frontend is based on Thymeleaf, but developers can use separate frontend frameworks via the API. Notable features include scheduled publishing, comment management, and SEO-friendly URLs.

Hosted under the GPL-3.0 license, Halo is maintained by a community of developers. It is particularly well suited for users who prefer a Java ecosystem and want full control over their hosting environment. The project has a growing plugin marketplace and active documentation for contributors and administrators.