GNOME is a desktop environment and graphical user interface (GUI) that runs on top of a computer operating system. It is composed entirely of free and open source software and is developed by both volunteers and paid contributors, the largest corporate contributor being Red Hat.

Gentoo is a free operating system based on either Linux or FreeBSD that can be automatically optimized and customized for just about any application or need. Extreme configurability, performance and a top-notch user and developer community are all hallmarks of the Gentoo experience.

The cultural social center La Piluka is an autonomous self-managed space for sharing resources, knowledge and political action in the Barrio del Pilar neighborhood (Madrid)

The World Wide Web Consortium (W3C) is an international community that develops open standards to ensure the long-term growth of the Web. On 29 August 2012 five leading global organizations jointly signed an agreement to affirm and adhere to a set of Principles in support of The Modern Paradigm for Standards; an open and collectively empowering model that will help radically improve the way people around the world develop new technologies and innovate for humanity. Learn more about OpenStand: the modern paradigm for standards.

Claroline is an Open Source software to easily deploy a platform for learning and collaboration online. Available in many languages, Claroline can be downloaded free and installed freely. Claroline is based on a flexible educational model that information becomes knowledge through the activities and productions of the learner in a system driven by the motivation and interaction. The wide range of tools made available to the user allows any instructor or student to establish or operate an educational device for learning.

CiviCRM is a web-based, internationalized suite of computer software for constituency relationship management, that falls under the broad rubric of customer relationship management. It is specifically designed for the needs of non-profit, non-governmental, and advocacy groups, and serves as an association management system. CiviCRM is designed to manage information about an organization's donors, members, event registrants, subscribers, grant application seekers and funders, and case contacts.

Sakai is a community of academic institutions, commercial organizations and individuals who work together to develop a common Collaboration and Learning Environment (CLE).

LibreOffice is a free and open source office suite, developed by The Document Foundation. It was forked from OpenOffice.org in 2010. The LibreOffice suite comprises programs to do word processing, spreadsheets, slideshows, diagrams and drawings, maintain databases, and compose math formulae.

Wireshark is a free and open-source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education. Originally named Ethereal, in May 2006 the project was renamed Wireshark due to trademark issues.

OpenBSD is a Unix-like computer operating system descended from Berkeley Software Distribution (BSD), a Unix derivative developed at the University of California, Berkeley. It was forked from NetBSD by project leader Theo de Raadt in late 1995. As well as the operating system, the OpenBSD Project has produced portable versions of numerous subsystems, most notably PF, OpenSSH and OpenNTPD, which are very widely available as packages in other operating systems.