I am really interested in Complex Event Processing and have been looking at Esper. However my company has an anti-GPL stance and I was wondering if there are non-GPL alternatives out there under a more business friendly license like Apache or BSD?
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Apache Flink has a CEP module now – Neil McGuigan Jul 04 '18 at 17:49
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Quite late, but here you can find an overview, too. CEP vendor overview
dabuki
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1The site can still be accessed via the [Wayback Machine](https://web.archive.org/web/20131008031358/http://rulecore.com/CEPblog/?page_id=47). – Simon Aug 19 '14 at 12:25
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FWIW, Esper has a non-GPL license if that's what you're after. Go to their website at www.espertech.com - otherwise the community license is just GPL.
Ajaxx
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Drools Fusion has an ASL-style license (http://legacy.drools.codehaus.org/Licensing). Pion is another open-source system with an AGPL license. If you prefer a normal commercial license there's Aleri, Streambase and ruleCore. Aleri and streambase are "normal" software and ruleCore is a CEP cloud.
jbellis
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2If GPL is not-business-friendly, then AGPL is more so. My plain english read of GPL vs AGPL is AGPL prohibits even loose-coupled (not linked) usage of functional with/without an formal API, where the ecosystem is proprietary. Typically when people are looking for business-friendly FOSS, they are basically looking to reap the benefits of open-source without necessarily having to give back any. For all the love-n-affection many corporates show towards Open-source, this is the single biggest motivation, apart from some PR brownie-points. – bdutta74 May 25 '11 at 14:56
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There is book coming up on CEP; chapter 1 available here for free (no login required) lists a number of systems, but no license information: http://www.manning.com/etzion/Etzion_MEAPch01_free.pdf
jbellis
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Soloren2001
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Look at page 28-29, they list the languages for Event Programming. – Soloren2001 Jul 15 '10 at 19:10
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You can look at ERMA (Extremely Reusable Monitoring API). It was developed by Orbitz for internal use, and they have open sourced it a while ago. It uses the Apache License.
David Rabinowitz
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You might want to take a look at OpenESB's Intelligent Event Processor. I have not looked at it in any detail, but I did find it difficult to determine exactly what the underlying API was. Rather, it talks a lot about a NetBeans IDE that allows you define an event processing work-flow, which is ok, but what I would like to understand better is what the real API is underlying the IDE. In contrast, Esper is all about the API and much lighter on the assistive tools.
I am also not sure what the license is, but I assume that as part of the Sun GlassFish initiative, it would be CDDL (correct acronym ?)
Nicholas
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FYI Esper Enterprise Edition does not use the GPL. I.e. no copy left problem...
Can I freely use Esper in my application?
Esper is licensed under the open source GPL GNU Public License v2.0 license. You may check this license depending on your application and how you redistribute it. Restrictions may apply. You should consider Esper Enterprise Edition for any production use. Esper Enterprise Edition is not made available under a viral copyleft license and combines Esper, EsperJMX, EsperJDBC and Esper Studio in one single certified and supported package for maximal productivity, interoperability and manageability.
Antony Stubbs
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The rulecore cep server has a non-gpl (closed) source code license. If you purchase a license from ruleCore, you are allowed to modify the source and distribute your own version without showing your modifies source code to anyone. Might be a good idea for a commercial project with all kinds of IP issues.
