Heartbeat is now in the OpenBSD tree. (Among other "cluster"ing systems, pls. define your understanding of "cluster".).
Clusters as "CPU sharing" still work best with the "old" Linux 2.4.* kernel (although OpenMOSIX stopped upgrading).
You also can run applications on one CPU while using another box to share files. Or boot a headless box and run processes on it. Or ...
what is your question?
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