BOINC (Berkeley Open Infrastructure for Network Computing) is an open-source software platform for distributed computing that employs volunteered computer resources. It uses idle CPU cycles of participating computers to perform scientific calculations. The BOINC service at CERN hosts BOINC servers for LHC@home. Its first application has been SixTrack, which simulates particles circulating around the Large Hadron Collider (LHC) ring to study the long-term stability of the particle orbits. A second application is Test4Theory, that utilizes virtual machine technology to run simulation of LHC events on host computers. Additional applications are ATLAS simulations, and recently also simulations from LHCb and CMS.