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Open Source Tools

Free software tools from Azul Systems that help you manage and measure your Java-based deployments


An open source tool that highlights latency outliers.

jRT Socket Response Tool

jRT provides a quick picture of end-user response time in live apps.

Azul Inspector

Collects info about Java apps and their environment.


A package of open source tools for latency reporting and analysis.

Learn more about jHiccup

jHiccup generates “hiccup charts” that show the latency inherent in your app, to the 99.9999th percentile. Hiccup charts show latency across the entire test interval. jHiccup has minimal overhead, is written in Java, and is free. Download here or from GitHub.

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jRT helps you measure what end-users are seeing

jRT measures the socket response and return time spectrum associated with an application’s network-facing platform. The tool captures the time-series and variability of the socket-based application code, JVM, OS, hypervisor and HW as application response times.

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Azul Inspector is essential during Zing pilots

Developers, and performance engineers can use Azul Inspector to quickly determine the JDK version in use, max heap size setting and the values of a variety of other setup variables. More on Azul Inspector how can be used is available in this blog post.

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Other Azul open source initiatives

Zulu: Certified builds of OpenJDK

Java developers who want a fully-tested multiplatform build of Java SE 8, 7 or 6 can download Zulu free here > (new Zulu download page)

Zulu on Microsoft Azure

Zulu 8, 7 and 6 builds are available on the Microsoft Azure Marketplace on multiple machine images

Zulu on Docker: Ready for Use!

Zulu has been available on the Docker Hub since the Fall of 2014. Get it for Debian or CentOS

Zulu on the Canonical Charm Store

You can download and deploy Zulu 8 for Ubuntu Trusty on Canonical’s Juju Charm store

Zulu Open Source Java for the IoT

Custom builds of OpenJDK for Embedded Java SE 8, 7, or even 6 are available from Azul. Learn more now

Get Azul tools from GitHub

Sources and documentation for jHiccup, LatencyUtils, jRT, and HDRHistoGram are all available on GitHub

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