Project Summary
Complex Event Processing, or CEP, is technology to process events and discover complex patterns among multiple streams of event data. ESP stands for Event Stream Processing and deals with the task of processing multiple streams of event data with the goal of identifying the meaningful events within those streams, and deriving meaningful information from them.
The Esper engine has been developed to address the requirements of applications that analyze and react to events.
In a Nutshell, Esper...
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took an estimated 166 years of effort (COCOMO model)
starting with its first commit in April, 2015
ending with its most recent commit about 2 years ago
Quick Reference
GNU General Public License v2.0 or later
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These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
There are no reported vulnerabilities
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30 Day SummaryJun 19 2026 — Jul 19 2026
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12 Month SummaryJul 19 2025 — Jul 19 2026
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