Where you can download OpenJDK?
Here you are:
Latest Releases | Adoptium
Eclipse Adoptium provides prebuilt OpenJDK binaries from a fully open source set of build scripts and infrastructure. Supported platforms include Linux, macOS, Windows, ARM, Solaris, and AIX.
OpenJDK Downloads | Download Java JDK 8 & 11 | OpenLogic
OpenLogic provides free OpenJDK Java downloads for OpenJDK 8 and OpenJDK 11. Get your JDK download today. Plus, get answers to your FAQ about Java development and download Java JDK 8 and Java 11.
OpenJDK: Download and install
Download the Microsoft Build of OpenJDK
Describes where to download the Microsoft Build of OpenJDK.
Red Hat build of OpenJDK | Red Hat Developer
The Red Hat build of OpenJDK is a free and supportable open source implementation of the Java Platform, Standard Edition (Java SE).