I've been looking for some Event Driven Architecture engines or correlational and filtering engines; I only found Esper out there, I wonder if you know and would recommend any other EDA engines.
Thanks a lot!
I would also recommend to google some Enterprise Service Bus products. Most of the ESBs do support event driven architectures if you do not want to implement on your own.
have you found what you were looking for? Is there something in Esper you'd like to have but wasn't available?