CERN, the European Organization for Nuclear Research, launched its open data portal today granting free access to datasets from Large Hadron Collider experiments. CERN expects the data to be highly valuable to the research community and to educators. CERN is also providing free, open source software to read, analyze, and visualize the data. The open data portal includes datasets from prominent CERN experiments like the ALICE, ATLAS, CMS, and LHCb collaborations. All of the data in the open data portal is shared in the public domain, free for sharing and reuse by all.