OSOR.eu is a collaborative platform launched in 2008 by the European Commission to help public administrations share open-source IT solutions, experiences, and knowledge. The platform includes an observatory with news and studies to inform decision-makers, and a repository where developers can upload, download, and collaborate on over 2,400 open-source projects under licenses like the EUPL. OSOR.eu aims to promote open-source software adoption among public administrations by allowing them to find and reuse existing solutions.