Introduction

The original contents is written in Japanese "OpenJDKと各種JDKディストリビューションの情報源まとめ #minjava". If the translation is strange, please send edit requests to this article. Linked contents may be in Japanese.

This article is part of the Mar 13th, 2020 publication "Everyone's Java" ('Minna-no-Java/a.k.a minjava' in Japanese) tie-up campaign.

Here's a quick blog post, and at the end of Section 2-4 "Most Recent JDK Distributions", in Chapter 2 which I am in charge of, I write some sources to keep track of.

I think you can follow the link in the case of the electronic version, but it will be difficult for those who purchased the paper version of the book, and the link may change in the future, so I will summarize it as this article.
In addition, I'll add some links to the JDK you should keep an eye on in Section 2-4, as well as some references and additional information.
The EOL for each distribution in section 2-5 is summarized in @YujiSoftware's article "Summary of Java Release Dates and EOL", although it is best to check the latest information from the Lifecycle link.

The basic sources for insight into the OpenJDK Project

Type and name	URL	Usage and Remarks
Site Top	https://openjdk.org/	The structure is a bit complex because this site is for OpenJDK developers.
JDK Enhancement Proposal (JEP)	https://openjdk.org/jeps/0	You can see which features are included in each JDK version. Introduced in 2011, it is leading JSR by JCP.
JDK Project	https://openjdk.org/projects/jdk/	JDK release schedule and the included JEP
OCTLA Signatories List	https://openjdk.org/groups/conformance/JckAccess/jck-access.html	List of signers with access to a technology compatibility kit (TCK/JCK) that certifies formal implementation of Java
OpenJDK Vulnerability Advisories	https://openjdk.org/groups/vulnerability/advisories/	Vulnerability information shared and published by OpenJDK Vulnerability Group
SNS	@openjdk@mastodon.social, @OpenJDK
Mailing Lists (ML)	https://mail.openjdk.org/	You can browse, subscribe to, and post topics of interest.
JDK Bug System (JBS)	https://bugs.openjdk.org/	Issue Tracking by JIRA (Not only Bug but also enhancements, compatibility checks, etc.)
Source Code Control	https://github.com/openjdk	Formerly managed by Mercurial, migrated to GitHub with Project Skara

Major multi-platform JDKs

The information presented here is based on publicly available, and if commercial support is available, you may find more information on the dedicated site.
Basically, they are listed in the order of first official release, but Oracle JDK and Oracle OpenJDK are listed continuously because of their close relationship.

Oracle JDK (Oracle Java SE)

General Information	Type and name	Where to find
Development and Operation	Documents	https://docs.oracle.com/en/java/javase/index.html (Required not only for Oracle JDK but also for other JDKs)
	Release notes	https://www.oracle.com/java/technologies/javase/jdk-relnotes-index.html
	Vulnerability-related	https://www.oracle.com/security-alerts/
	Lifecycle	https://www.oracle.com/java/technologies/java-se-support-roadmap.html
	Certified platforms	https://www.oracle.com/java/technologies/javase-subscription/documentation.html#sysconfig
Trend Understanding	SNS	@Java (Various sources of Java, not just Oracle JDK)
	Blog	https://blogs.oracle.com/java/
Download	For personal and development	https://www.oracle.com/java/technologies/downloads/ *Authentication required except for the latest version. (JRE for java.com currently does not require authentication.)
	For commercial customers	https://support.oracle.com/epmos/faces/DocContentDisplay?id=1439822.1
License	Oracle Binary Code License (BCL for Java SE)	https://www.oracle.com/downloads/licenses/binary-code-license.html *~10, ~8u201/202
	Oracle Technology Network License Agreement (OTNLA) for Oracle Java SE	https://www.oracle.com/downloads/licenses/javase-license1.html 11~, 8u211/212~, (17 or later).0.13~ : 1 year after the next LTS
	Oracle No-Fee Terms and Conditions (NFTC)	https://www.oracle.com/downloads/licenses/no-fee-license.html (JDK17 or later)~.0.12 : up to 1 year after the next LTS

Originally, Java SE Embedded has been free development, and the deployment required royalty, so it can be said that the same thing happened since JDK 11
Since JDK 17, the license has been revised and is now free under certain conditions. For more details, please refer to the Oracle Java SE Licensing FAQ
- Since the licensing terms for Oracle JDK can be quite confusing, please also refer to @hoka-shino's article, "[Free and Paid Java Licenses] Oracle JDK License and Support Explanation"

Oracle OpenJDK

General Information	Description
Development and Operation	Same as Oracle JDK, but with a half-year lifecycle only (Until the next feature release)
Trend Understanding	Same as Oracle JDK, but with links from the download page
Download	https://jdk.java.net/ *JDK9~. No authentication required
License	GPLv2 + Classpath Exception (GNU General Public License, version 2, with the Classpath Exception)

The license is the same as the OpenJDK source code. : https://openjdk.org/legal/gplv2+ce.html
Reference material: "Let's talk anew about Oracle-supplied JDKs"

Red Hat build of OpenJDK

General Information	Type and name	Where to find
Development and Operation	Documents	https://docs.redhat.com/documentation/en-us/red_hat_build_of_openjdk/
	Release notes	(See above)
	Lifecycle	https://access.redhat.com/articles/1299013
	Certified platforms	(See above)
Trend Understanding	SNS	@RedHatJava, @rhdevelopers
	Blog	https://developers.redhat.com/topics/java/all
Download	For Developers	https://developers.redhat.com/products/openjdk/download *Authentication required
	For commercial customers	https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?product=core.service.openjdk&downloadType=distributions *Subscription, such as the JBoss product, is required. There is also a yum repository for RHEL.
License	GPLv2 + Classpath Exception

Reference material: "Red Hat's OpenJDK"

Azul Zulu

General Information	Type and name	Where to find
Development and Operation	Documents	https://docs.azul.com/core/
	Release notes	https://docs.azul.com/core/release-notes.html
	Lifecycle	https://www.azul.com/products/azul-support-roadmap/
	Certified platforms	https://docs.azul.com/core/supported-platforms.html
Trend Understanding	SNS	@AzulSystems
	Blog	https://www.azul.com/blog/
	GitHub	https://github.com/zulu-openjdk *Currently mostly for Dockerfile
Download		https://www.azul.com/downloads/ *No authentication required
License	GPLv2 + Classpath Exception

BellSoft Liberica JDK

General Information	Type and name	Where to find
Development and Operation	Documents	https://docs.bell-sw.com/liberica-jdk/
	Release notes	https://docs.bell-sw.com/liberica-jdk/latest/general/release-notes/
	Lifecycle	https://bell-sw.com/support/#roadmap
	Certified platforms	https://bell-sw.com/pages/supported-configurations/
Trend Understanding	SNS	@bellsoftware
	Blog	https://bell-sw.com/blog/
	GitHub	https://github.com/bell-sw/Liberica
Download		https://bell-sw.com/pages/downloads/ *No authentication required
License	GPLv2 + Classpath Exception

SAP SapMachine

General Information	Type and name	Where to find
Development and Operation	Documents	https://sapmachine.io/docs/
	Release notes	(not found)
	Lifecycle	https://sapmachine.io/docs/maintenance-and-support
	Certified platforms	https://sapmachine.io/docs/certification-and-java-compatibility
Trend Understanding	SNS	@SweetSapMachine
	Blog	https://community.sap.com/t5/c-khhcw49343/SAP+Java+Virtual+Machine/pd-p/01200615320800003576
	GitHub	https://github.com/SAP/SapMachine
Download		https://sapmachine.io/ *No authentication required (Download from GitHub)
License	GPLv2 + Classpath Exception

Amazon Corretto

General Information	Type and name	Where to find
Development and Operation	Documents	https://docs.aws.amazon.com/corretto/
	Release notes (Corretto 8)	https://github.com/corretto/corretto-8/blob/develop/CHANGELOG.md
	Release notes (Corretto 11)	https://github.com/corretto/corretto-11/blob/develop/CHANGELOG.md
	Release notes (Corretto 17)	https://github.com/corretto/corretto-17/blob/develop/CHANGELOG.md
	Release notes (Corretto 21)	https://github.com/corretto/corretto-21/blob/develop/CHANGELOG.md
	Release notes (Corretto 25)	https://github.com/corretto/corretto-25/blob/develop/CHANGELOG.md
	Lifecycle	https://aws.amazon.com/corretto/faqs/
	Certified platforms	https://aws.amazon.com/corretto/faqs/#using-amazon-corretto--1dv3diw
Trend Understanding	SNS	@AWSOpen
	Blog	https://aws.amazon.com/blogs/opensource/category/programing-language/java/
	GitHub	https://github.com/corretto/
Download		https://downloads.corretto.aws/ *No authentication required
License	GPLv2 + Classpath Exception

Microsoft Build of OpenJDK

This is not mentioned in the book because of not announced at the time of writing.

General Information	Type and name	Where to find
Development and Operation	Documents	https://learn.microsoft.com/en-us/java/openjdk/
	Release notes	https://learn.microsoft.com/en-us/java/openjdk/release-notes
	Lifecycle	https://learn.microsoft.com/en-us/java/openjdk/support
	Certified platforms	(See above)
Trend Understanding	SNS	@JavaAtMicrosoft
	Blog	https://devblogs.microsoft.com/java/
	GitHub	https://github.com/microsoft/openjdk
Download		https://learn.microsoft.com/en-us/java/openjdk/download *No authentication required
License	GPLv2 + Classpath Exception

Eclipse Temurin (Adoptium)

Formerly known as AdoptOpenJDK, but the transition was completed in August 2021.

General Information	Type and name	Where to find
Development and Operation	Documents	https://adoptium.net/docs/
	Release notes	https://adoptium.net/temurin/release-notes
	Lifecycle	https://adoptium.net/support/
	Certified platforms	https://adoptium.net/supported-platforms/
Trend Understanding	SNS	@adoptium, Slack
	Blog	https://adoptium.net/blog/
	GitHub	https://github.com/adoptium
Download		https://adoptium.net/temurin/releases *No authentication required (Download from GitHub)
License	GPLv2 + Classpath Exception

Some of the JDK vendors mentioned in this article are strategic members of Eclipse Adoptium.

Other notable JDKs

The following are basic links only.

OpenJDK with HotSpot VM Base

OpenJDK in each Linux distribution

*Other links to OpenJDK packages for Linux distributions will be added as appropriate, so please point them out in the comments.

JDK of the Japanese vendor

Fujitsu's OpenJDK (for Fujitsu Software Enterprise Application Platform)
- The de facto successor to Fujitsu Software Interstage FJVM
Hitachi's own Java VM (for Hitachi Cosminexus)

Others

The listed below are not mentioned in the book.

OpenJDK with NOT HotSpot VM

IBM Semeru Runtimes (formerly known as AdoptOpenJDK with OpenJ9
- Reference article: "IBM Semeru Runtimes: A new Java runtime environment available free of charge"
IBM SDK Java Technology Edition
- Reference material: "About OpenJ9 VM and IBM Java"
Azul Platform Prime (formerly known as Zing)
GraalVM
- Technically HotSpot based, but with a different JIT compiler (See chapter 5 of the book for details)
Mandrel (not mentioned in the book)
- Reference article: "Mandrel: A specialized distribution of GraalVM for Quarkus"