I heard that trading firms employ CEP platforms such as StreamBase, Marketcetera, JBoss Drools, and etc., to implement trading systems. I wonder which one is most popular and the recent trend of related technology.

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    $\begingroup$ We're trying to avoid surveys during the beta. Also, Marketcetera isn't a CEP; it uses Esper. $\endgroup$ Feb 17, 2011 at 20:26
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    $\begingroup$ CEP is certainly on-topic, but I agree with @chrisaycock: this question isn't appropriate for the site. There is no way to answer which is the most popular, especially when you start to include things like open source solutions. $\endgroup$
    – Shane
    Feb 17, 2011 at 20:33
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    $\begingroup$ Have a look at AlgoTrader. It is based on Esper. There is a free Open Source Version and a commercial Enterprise Version. $\endgroup$
    – Andy Flury
    Jun 12, 2013 at 9:42