These are events.xml files for Veritas Command Central, OpsCenter, and VOM. Use at your own risk. Use responsibly.
OpenNMS events are similar to MIB files, but OpenNMS doesn't use MIBs. They use XML. I have found no XML for these products online anywhere, so I created my own. These are available for those people like me, who haven't been able to find them online. Now you have. ;)