Java Ports and Java Virtual Machines (Java 2 Standard Edition)

• Sun Microsystems (Windows, Solaris, Linux)
• IBM (AIX, Linux, OS/2, z/OS, Windows)
• Apple (Mac OS)
• HP (HP-UX)
• BEA WebLogic JRockit (Windows, Linux)
• Blackdown (Linux)
• SCO (Open Unix, UnixWare, OpenServer)
• Jikes Research Virtual Machine - RVM (Linux, AIX, OS X)
• FreeBSD Java Project (FreeBSD)
• Kaffe (Linux, FreeBSD)
• Japhar (Linux)

Java for mobile devices (Java 2 Micro Edition)

• Sun Microsystems
• Nokia
• Siemens
• Motorola
• Sony Ericsson
• IBM developerWorks Wireless technology
• Palm OS
• List of J2ME-enabled devices

Real-Time and Embedded Java (RTSJ, J2ME CDC/CLDC)

• TimeSys JTime (Linux)
• WebSphere Micro Environment (Linux, OSE, Palm OS,  QNX, BREW, Windows, PocketPC)
• Skelmir CEE-J (Windows, Linux, pSOS, VxWorks, MacOS/X, PocketPC, Solaris, Chorus, Nucleus RTOS)
• Esmertec Jbed
• Lynx Aphelion (LynxOs RTOS)
• simpleRTJ (various 16-32 bit processors)
• NewMonics PERC (VxWorks, VxSim, OSE, OSE Softkernel, Linux, Windows)
• RadiSys/Microware PersonalJava (OS-9)
• Tau Group Intent Java
• aJile aJ-100 (chip-based)
• Imsys Embedded Java Platform (chip-based)
• Ignite vxPresso Personal Java (chip-based)
• Specifications and expert groups:
  • The Real-Time for Java Expert Group (Real-Time Specification for Java)
  • J Consortium (Real-Time Java Working Group)

Java Tools (editors, compilers, etc.)

• SUN/JDK Java Tools
• IBM Java Tools
• GNU Java Tools
• Eclipse (open source IDE/platform)
• Emacs/JDEE (Java IDE extension for Emacs)
• NetBeans (open source IDE/platform)
• JBuilder (IDE)
• GCJ (GNU Java compiler)
• Jikes (open source Java compiler)
• Apache Ant (build tool)
• JUnit (unit test framework)
• Apahce Jakarta (open source tools and libraries)