If you are interested in the legacy Fedora 3, here is its wiki space.
Fedora is a robust, modular, open source repository system for the management and dissemination of digital content. It is especially suited for digital libraries and archives, both for access and preservation. It is also used to provide specialized access to very large and complex digital collections of historic and cultural materials as well as scientific data. Fedora has a worldwide installed user base that includes academic and cultural heritage organizations, universities, research institutions, university libraries, national libraries, and government agencies. The Fedora community is supported by the stewardship of the DuraSpace organization.
Fedora stakeholders, working in concert with DuraSpace, are organizing a software development project designed to make major improvements to Fedora over the course of approximately two and a half years. The project, Fedora Four, will use a combination of financial contributions from the community and developer resources contributed in-kind by stakeholder organizations. We expect that current Fedora committers will form the core of this developer group, and that their work will be supplemented by other developers. The project will be executed in close alignment with the existing Fedora committer/developer team.
The Fedora Four project will address the top priority requirements expressed by the international community over the past few years. These will include:
improved performance, enhanced vertical and horizontal scalability
more flexible storage options
features to accommodate research data management
better capabilities for participating in the world of linked open data
an improved platform for developers—one that is easier to work with and which will attract a larger core of developers.
These goals, once realized, will position Fedora as an effective platform for the next decade.