github.com/facebook/hhvm · Edit this at Wikidata. Written in, PHP, C++, OCaml and Rust · License · PHP License and Zend License. Website, HHVM.com. HipHop Virtual Machine (HHVM) is an open-source virtual machine based on just -in-time (JIT) ... for the C# language) and Java virtual machine (JVM, for the Java language).