Side-by-side comparison

High-performance JDK with ahead-of-time native-image compilation and polyglot language support.

Microsoft's open-source, cross-platform runtime and SDK for C# and F#; yearly November releases.

Low-footprint JVM from IBM (in Semeru runtimes) tuned for fast startup and dense containers.

Original cross-platform .NET implementation, now handed to WineHQ; superseded by modern .NET.