There is also http://geteventstore.com/ http://geteventstore.com/ - an immutable event database by one of the main CQRS aficionados - Greg Young. BTW, clustere

There is also http://geteventstore.com/ http://geteventstore.com/ - an immutable event database by one of the main CQRS aficionados - Greg Young. BTW, clustered HA setup has been opensourced very recently. Really solid and fun to work with.