Other
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GraalVM - a universal virtual machine for running applications written in JavaScript, Python, Ruby, R, JVM-based languages like Java, Scala, Kotlin, Clojure, and LLVM-based languages such as C and C++. AOT included.
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Alibaba Dragonwell8 - an in-house OpenJDK implementation at Alibaba optimized for online e-commerce, financial, logistics applications running on 100,000+ servers. Alibaba Dragonwell is the engine that runs these distributed Java applications in extreme scaling.
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JetBrains Runtime - A runtime environment for running IntelliJ Platform on Win/Mac/GNU-Linux. It's based on OpenJDK project with some modifications: Subpixel Anti-Aliasing, enhanced font rendering on GNU-Linux, HiDPI support, ligatures, some fixes for native crashes not presented in official builds, and other small enhancements.
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GNU IcedTea - provides a harness to build OpenJDK using Free Software build tools and adds a number of key features like special fixes, non-standard JITs and even support for alternative JamVM & CACAO virtual machines.
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Aleksey Shipilev’s Binary Builds - bleeding edge release and debug JDK builds, JDK tools, and other development goodies.