GNU General Public License v2.0 (GNU GPLv2)

The GNU GPL is the most widely used free software license and has a strong copyleft requirement. When distributing derived works, the source code of the work must be made available under the same license. There are multiple variants of the GNU GPL, each with different requirements.

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Piwigo

Open-source photo gallery management system. Enables creation and management of digital photo galleries.

Vanilla Forums

Open-source community forum software with enterprise features. Provides advanced community engagement and moderation tools.

InstantCMS

Open-source content management system with social networking features. Enables creation of community websites and portals.

Plone

Secure and flexible open-source CMS built on Python. Known for its strong security features and extensibility.

WordPress

World's most popular open-source content management system powering over 40% of all websites. Offers extensive plugin ecosystem, themes, and robust community support for blogs, e-commerce, and corporate websites. Highly customizable and scalable platform suitable for beginners and advanced developers.

phpBB

Popular open-source forum software. Offers extensive features for building and managing online communities.

Discourse

Open-source discussion platform for creating modern online communities and forums. Provides advanced moderation and engagement tools.

TYPO3

Enterprise-level open-source content management system with extensive customization capabilities. Particularly strong in multilingual and large-scale enterprise website deployments.

DokuWiki

Simple to use, open-source wiki software that doesn't require a database. Popular for creating internal documentation and knowledge bases.

Joomla!

Open-source content management system known for flexibility and extensibility. Supports multilingual websites and offers extensive extensions for various functionalities like e-commerce, social networking, and more.