These products are found extensively in commercial or research/academic use:

• Veritas Cluster Server – multi-platform
• Sun Cluster – Solaris/OpenSolaris only
• Netra High Availability Suite – Solaris and Linux
• OpenVMS – The original clustering OS – runs on VAX, Alpha and Itanium(2) only, still no EOL
• HP ServiceGuard for HP/UX and Linux
• Linux-HA — a commonly used free software HA package for the Linux OS.
• Red Hat Cluster Suite – Linux only
• IBM High Availability Cluster Multiprocessing (HACMP) for AIX and Linux
• Microsoft Cluster Server (MSCS) – Windows only
• Parallel Sysplex – unique to IBM mainframes
• IBM Tivoli System Automation – z/OS, AIX, Linux, Windows Server 2003

Other Clusters
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These cluster systems are less commonly found in production.

• NEC ExpressCluster – Windows and Linux
• TruCluster
• iCluster – for iSeries
• Novell Cluster Services for NetWare and SUSE Linux
• PRIMECLUSTER for Solaris and Linux
• OpenClovis ASP Open Source Solution
• openMOSIX Gentoo Linux
• ENEA Element for Super Cluster Architectures
• GoAhead SAFfire & SelfReliant for Linux, Windows, VxWorks and Solaris
• SteelEye LifeKeeper for Linux and Windows
• RSF-1 for AIX, HP-UX, Linux, Solaris, Mac OS X
• HA/FST – Open Source HA for Solaris (SPARC,x86)
• HA-OSCAR – High Availability Open Source Cluster Application
• OpenSSI for Linux
• EMC Corporation AutoStart for all platforms [1]
• VMware Infrastructure 3 (VI3) – High Availability for Virtual Servers
• NCache – Clustered object caching and Distributed ASP .NET Session State solution
• WanSyncHA – High Availability for MS platforms, based on real-time replication and automatic failover and failback.
• MyWindowsHearbeat – Open Source Solution for Windows (IP – Failover,..)

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