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My understanding is that Oracle Clusterware is Oracle's clustering solution
and Oracle RAC sits on top of that solution to provide clustering deployment of Oracle Databases only ?RAC is an Oracle database option that allows multiple database instances to work in active/active mode for a single database.
Can Oracle Clusterware be used to deploy non Oracle applications ( i.e. is it a general clustering solution ) ?Yes. See http://docs.oracle.com/cd/E11882_01/rac.112/e16794/crschp.htm#CHDGHGJA .
Can Oracle Clusterware be used to deploy non Oracle applicationsYes. There is a good video (http://www.dsvolk.ru/oracle/racdd4d/demos/video/clusterware/clusterware_viewlet_swf.html) about how to protect non Oracle solutions by using Oracle Clusterware (in video, my fried Igor Melnikov protects the Apache server).
Exactly. As the others experts here said, Oracle Real Application Clusters is a cluster solution. Although not only for Oracle Database, but for another Oracle produtcs as well. Hyperion Cluster, OSB (Oracle Service Bus) and Weblogic App Server are some examples to follow. (look the links below)
You can also use Oracle RAC to made a Shared File System solution (eg: ACFS).
Hope have helped