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.
Gno: An interpreted, stack-based Go virtual machine to build succinct and composable apps + gno.land: a blockchain for timeless code and fair open-source.
JQuick Java: a lightweight Java-like scripting language for rule engines. Declare, parse and execute business rules at runtime via XML or inline scripts—no restart needed. Java 8+, embeddable, with LSP and IDEA plugin support.