SETI@home. However, other distributed computing projects use BOINC. BOINC allows you to participate in multiple projects, and to control how your resources (such as computer time and disk space) are divided among these projects.
Projects are independent, and each maintains its own servers. The BOINC developers and the University of California have no control over the creation of BOINC-based projects, and do not endorse them. The BOINC web sites lists some, but not all, projects. A more complete list is on the BOINC Wiki.
When you participate in a project, you entrust that project with the health of your computer and the privacy of your data. In deciding whether to participate in a project, you should consider the following questions: