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AdoptOpenJDK uses infrastructure, build and test scripts to produce prebuilt binaries from OpenJDK™ class libraries and a choice of either the OpenJDK HotSpot or Eclipse OpenJ9 VM.
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All Zulu builds [of OpenJDK] are TCK-tested and free to download and use without restrictions.
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A no-cost, multiplatform, production-ready distribution of the Open Java Development Kit (OpenJDK). Corretto comes with long-term support that will include performance enhancements and security fixes.
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[...] A SAP supported version of OpenJDK for SAP customers and partners who wish to use OpenJDK to run their applications.
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The Red Hat build of OpenJDK is a free and open source implementation of the Java Platform, Standard Edition (Java SE).
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Liberica is a 100% open-source Java 8, 9, 10, 11 & 12 implementation. It is built from OpenJDK which BellSoft contributes to, thoroughly tested and passed the JCK as provided under the license from OpenJDK.
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Develop and test Java™ Platform Standard Edition applications and applets with the IBM Software Development Kit.
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[T]he in-house OpenJDK implementation at Alibaba optimized for online e-commerce, financial, logistics applications running on 100,000+ servers. [...]
The current release supports Linux/x86_64 platform only.
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Many Linux distributions already have their own OpenJDK builds. Check your package manager.