Blackdown's work formed the basis for Sun's official JDK for Linux-x86. Work continues on porting for other versions and architectures, including SPARC, PowerPC, and ARM; improvements to the x86 ports; and ports of extensions like JMF.

For Tru64 Unix, OpenVMS Alpha, Windows NT/Alpha and Linux/Alpha.

The official port of Sun's JDK to FreeBSD.

Version 1.3 available.

Sun's source code for their implementations of the Java 2 Platform, Standard Edition, available free of charge.

JDKs for SCO systems.

Sun's official page for the Java 2 Platform, Standard Edition (also known as JDK 1.2), with free downloads for Windows 95/98/NT/2000, Solaris and Linux.

Optimising Java native compiler for Windows. [Commercial]

Highly scalable virtual machine with dynamic code optimization, available for WinNT/2000 and Linux. [Commercial]

Apple's official MRJ.

A system for statically compiling and linking JVM bytecode applications. It includes an optimizing ahead-of-time compiler, a linker and recompilation manager, an advanced thread-hot runtime, and a core set of optimized libraries compatible with SunTM's Java 2 release. (Win32 only). [Commercial]

Offers Novell supported runtimes for NetWare.

JDK ports with native thread support for Irix on SGI machines.