JDK main-line development https://openjdk.org/projects/jdk
Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.
Amazon Corretto 8 is a no-cost, multi-platform, production-ready distribution of OpenJDK 8
https://openjdk.org/projects/loom
Runtime environment based on OpenJDK for running IntelliJ Platform-based products on Windows, macOS, and Linux
https://openjdk.org/projects/jmc OpenJDK Mission Control, a production time profiling and diagnostics tools suite.
https://openjdk.org/projects/valhalla
Amazon Corretto 11 is a no-cost, multi-platform, production-ready distribution of OpenJDK 11
An OpenJDK release maintained and supported by SAP
https://openjdk.org/projects/code-tools
Alibaba Dragonwell8 JDK