With the rise of open-source and self-hosted forges such as Forgejo, Gitlab, or Sourcehut, the need for decentralized cooperation emerges as a real challenge. Ongoing experiments around ActivityPub and protocols linked to the Fediverse are today paving the way for a more robust and resilient ecosystem of collaborative platforms. We will, in particular, explore this topic in the context of research and development in science, education, and design.