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Vote for ServerCluster
ServerCluster is a software solution that clusters up to 32 servers and applications such as databases, web, mail etc. It provides monitoring with fault detection and automated failover to secondary nodes in the cluster. Main features include Clustering for up to 32 Servers with Automatic Updating, secure (SSL) multi platform JAVA based graphical user interface (GUI) for cluster configuration & secure remote management, configurable node resource check, cluster monitoring via SNMP to allow integration with platform management tools, an open documented Agent API for clustering any kind of "in-house" application and more.