Java and C/C++ developer web resources

C/C++ compiler suites

GNU GCC (many targets)
MinGW GCC (for Win32)
Cygwin GCC (for Win32)
DJGPP GCC (for MS-DOS 32-bit)
EMX GCC (for MS-DOS 32-bit, OS/2 32-bit)
GNUDE GCC (for ARM/XScale)
Open Watcom C/C++ (for MS-DOS, Win16, OS/2, MS-DOS 32-bit, Win32, OS/2 32-bit, QNX, Linux on x86)
Digital Mars C/C++ Compilers (for MS-DOS, Win16, OS/2, MS-DOS 32-bit, Win32, OS/2 32-bit)
Microsoft Visual C++ Studio/Express (for Win32, Win64)
Borland C/C++ Compiler/Builder (for MS-DOS, Win16, Win32)
C++Builder (RAD C++ development environment for Windows)
Intel C++ Compiler for Windows (for Win32, Win64)
Pelles C (for Win32, Pocket PC on ARM/XScale)
CC65 (for 6502 systems)
Tiny C Compiler (a small and fast C compiler for x86)
LCC-win32 (for Win32)
Lad CC386 (for MS-DOS, Win32)
WinARM (GCC toolchain for ARM processors and BREW platform)
WinAVR (GCC toolchain for Atmel AVR)
WinXSCALE (GCC Win32-hosted toolchain for XSCALE targets)
CeGCC/mingw32ce (GCC cross compiler for Windows Mobile, Windows Embedded, PocketPC, SmartPhone on arm and x86)
CeGCC (a cross compiler for Windows CE)
devkitPSP (GCC toolchain for the Sony PlayStation)
mingw-w64 (GCC for Win64 and Win32)
Xcode (Apple IDE and GCC for Mac OS X and iPhone)
Android NDK (toolkit for developing native code components for Android applications)
Microsoft WDK (Windows Driver Kit and Developer/Debugging Tools)

C/C++ standard "LibC" library implementations

Diet Libc (a libc optimized for small size)
NewLib (a C library intended for use on embedded systems)
uClibc (a C library for embedded Linux)
musl libc (a C/POSIX library and extensions for next generation of Linux-based devices)
Bionic libc (derivation of BSD standard C library code developed by Google for Android)
EGLIBC (a variant of GNU C Library designed to work well on embedded systems)

C/C++ stand-alone well-known libraries

fdlibm (LibM implementation)
Linuxthreads (POSIX 1003.1c kernel threads for Linux)
GNU Pth (The GNU Portable POSIX/ANSI-C Threads)
libatomic_ops (atomic memory operations library, part of BDWGC) [development Git repo]
Concurrency Kit (C library containing a plethora of concurrency primitives and lock-less data structures)
OpenPA (portable library providing a consistent C API for performing atomic operations)
zlib (general purpose data compression library)
libiconv (charset conversion library)
unixODBC (Open Source ODBC sub-system)
SQLite (self-contained serverless zero-configuration transactional SQL database engine library)
Watt-32 tcp/ip (Waterloo TCP/IP C library)
XULRunner (a Mozilla runtime package for bootstrapping XUL+XPCOM applications)
libffi (a portable Foreign Function Interface library)
FluidSynth (a real-time software synthesizer based on the SoundFont)

C/C++ garbage collector libraries

BoehmGC/BDWGC (Boehm-Demers-Weiser Conservative Garbage Collector) [development Git repo]
TinyGC (Tiny Garbage Collector - compact implementation of Boehm GC API subset)
MeixnerGC (Precise incremental mark and sweep garbage collector and smart pointer for C++)
LibGC for C++ (Portable garbage collection lib for C++ which uses the mark-and-sweep algorithm)
GC++ (A garbage collector for C++)
Smieciuch GC (Precise or nearly precise tracing garbage collector for C/C++)
SGCL (Precise concurrent Garbage Collection library for C++)

Small C libraries partially implementing standard API

T-PThread (Tiny portable "pthread" implementation) - part of JCGO

C/C++ stand-alone graphics libraries

GLib/GTK+ (graphics low-level library)
EFL (collection of libraries that make up the foundation of DR17 window manager)
cairo (Multi-platform 2D graphics library)
LibPNG (PNG graphic format library)
Pango (graphics layout and text rendering library)
FreeType (font handling library)
fontconfig (font config and look up library)
Qt/QML (cross-platform C++ application framework)
DirectFB (graphics library for embedded systems)
Nano-X/Microwindows (compact GUI back-end library)
wxWidgets (cross-platform GUI library)
Xynth (a portable embedded windowing system, client/server display interface)
directx (DirectX "minimalist" headers and source)

Native executable packers and protectors

UPX (Universal Executable Packer)
ASPack (Win32 executable file compressor)
PC Guard (Software copy protection and licensing system)
IntelliProtector (Software protection service)
PECompact (an advanced Windows executable compressor)
BoxedApp Packer (utility for converting full-fledged applications to single executable)
MoleBox (Software Virtualization and Protection Tools)
DLL to Lib (a converter of a DLL file into equivalent static library)
Ermine (a tool that allows software to be deployed in a single executable file)
ELF Statifier (tool for creating from dynamically linked executables and all it's libraries one ELF file)

Archive (de)compression utilities

7-Zip (7z/Zip/Tar+Gz/Tar+Bz2 archiver and multi-format unpacker for Windows)
WinRAR (Rar/Zip archiver and multi-format unpacker for Windows)
WinRK (a commercial file archiver with an ultra-high compression ratio)
paq8px (a file compressor with an ultra-high ratio)

DOS extenders, drivers and DOS clones

HX DOS extender (Win32 emulator for MS-DOS)
DOSLFN (driver for Long File Names in MS-DOS)
dosppp (PPPD for MS-DOS)
FreeDOS (free MS-DOS compatible OS)
RxDOS (fast MS-DOS real-time clone)
RTOS-32 (Win32 API Compatible Embedded Real-time OS)
Wine HQ (a program loader running Windows applications on Linux/POSIX)

Java VM with complete SDK suites

Sun/Oracle J2SE (Java 2 Standard Edition VM and SDK)
Sun/Oracle J2ME (Java 2 VM and SDK for Mobile Devices)
Sun/Oracle JavaCardKit (Development Kit for the Java Card)
IBM JDK for Windows (Java VM and SDK)

Stand-alone Java VM implementation

Aegis VM (Java VM implementation)
BeKaffe (Kaffe Java VM for BeOS)
cacaovm (Java VM with JIT compiler)
IKVM.NET (Java VM for .NET)
M-JVM (a KVM written in Java)
J-Smile VM (Java VM with GUI support)
JAmiga (Java VM for Amiga)
JamVM (Java VM implementation)
Jato VM (JIT-only Java virtual machine that aims to support JVM specification version 2)
JaOS (Java VM implementation)
Jelatine (Java ME/CLD VM implementation)
Jikes RVM (Research Virtual Machine)
joeq (Java VM written in Java)
Kaffe VM (Java VM with JIT compiler)
Kissme (Java VM implementation)
leJOS (Java system for Lego Mindstorms RCX)
TinyVM (replacement firmware and VM for Lego Mindstorms RCX)
MysaifuVM (Java VM for Windows Mobile)
CrEme (a J2ME/CDC Java VM technology for Embedded platforms)
phoneME (a J2ME open-source implementation for mobile handsets)
IBM J9 WEME ppro10 (Java VM for PocketPC and Windows Mobile on ARM)
NanoVM (a portable tiny Java VM running on microcontrollers with at least 8k code space, especially Atmel AVR)
simpleRTJ (a small footprint Java VM for embedded and consumer devices)
JControl (an extremely small and compact embedded Java solution, optimized for systems with low processing power)
JamaicaVM (a virtual machine and build environment for running realtime Java programs)
Squawk (an open source virtual machine for the Java written in Java)
OJI (Open Java VM Integration for Mozilla browsers)
ORP (Java VM Open Runtime Platform)
Aonix PERC (Real-time Java VM implementation)
ajile JME (a silicon-based real-time J2ME platform)
SableVM (Java VM implementation)
shuJIT (Java Just-in-Time Compiler for x86 processors)
teaseme (Linux-kernel Java VM)
Waba for DOS (Waba VM for MS-DOS with TCP/IP)
WabaVM (Waba VM and SDK for embedded devices)
Wonka (Java VM implementation)
EVE (Eve Virtual Machine and SDK for mobile and desktop PC)
Maxine VM (a meta-circular research VM)
Jaune (an ahead of time compiler for small systems)
VMKit (a framework based on LLVM for building virtual machines)
IcedRobot (The GNUlization of Android - an attempt to bring the Android API on Linux Desktop)
Avian (a lightweight virtual machine and class library designed to provide a useful subset of Java features, suitable for building self-contained applications)

Java to native code "through C" static compilers

JCGO (Java source to C code translator) [development Git repo]
JC (Java class into C source translator)
Toba (Java code to C code translator)
I3J2C (Java to C "intentional" compiler)
j2c (J2C converts Java source into compilable C++ code)
MCU Java Source (Java source to C source translator targeting MCU firmware)
Java2C (a translator from Java to C language for embedded and realtime applications)
Ptolemy II Java-to-C (a Java to C compiler based on Ptolemy 2 framework)
alcheMo (automated system to port a J2ME application to BREW, Windows Mobile and iPhone)
J2ME Polish: Janus (A toolset for porting J2ME/MIDP applications to different handsets - Windows Mobile, iPhone, Android)
Java2CPP (Compilers Project, compiles Java code to C++)
Java 2 CSharp (an automatic translator of Eclipse Java projects into Visual Studio ones)
Qs Moka (a Java source to TIGCC project converter)
Java2C++ (a translator from Java to C++)
Janus (Java to C++ source code converter without GC and threads support)
LLVM-DVK (Dalvik-to-native code translator using LLVM optimization framework)
J2ObjC (A Java to iOS Objective-C translation tool and runtime)
Titanium (Research Parallel Java 1.4 superset to C translator)

Direct Java to native code static compilers

GNU GCJ (a portable optimizing ahead-of-time compiler for Java - GCC front-end)
micro-libgcj (a lightweight version of the GCJ runtime and micro-SWT libraries)
Excelsior JET (Java to native executable converter)
JNC (Java to native executable converter)
Manta (Java to native code compiler)
Vortex (Java to native code compiler)
Timber (static whole-program compiler for Spar/Java)
JFE (a Front End for the Java Language by Edison Design Group allowing native execution of Java code without JVM)
ART (Android runtime static compiler)

Java-based PC Operating Systems

JNode (Java OS written in Java)
JOS (Java Operating System)
JJOS (Java VM based on jJOS/decaf)
JX OS (flexible Java OS)
Sanos (Minimal OS kernel for Java HotSpot VM)
Odiseo Desktop (Java multitasking environment)

C code to Java translators

AMPC (C to Java class files translator)
Novosoft C2J (C-code sources into Java classes translator)
c2java (the preprocessed C code to Java converter)
Mips2Java (C to Java source translator through MIPS GCC)
NestedVM (a tool providing MIPS binary translation for Java bytecode)
Cibyl (a binary translator that allows compiled C programs to execute on J2ME phones)

Multi-language translator suites

Octopus (syntax translator between Java, C#, VB.NET, C++)
XES (an XML-based source converter between Java and C++/C#)
Tangible Instant (Accurate Source Code Converters between VB, C#, C++, Java)
xmlvm (Java/.NET/Ruby compiler into Java/.NET/JavaScript/Python/Objective-C/C++)

Java-to-exe wrappers

Janel (a Java native executable and launcher for Windows)
J2Exe/J2TrayExe/J2WinService (Java to Win32 executable/service)
Tanuki Java Service Wrapper (multi-platform Java service wrapper)
JexePack (Java to Windows EXE/service)
JEXECreator (Java to Executable wrapper)
JavaLauncher (Java to Executable toolkit)
exe4j (a Java exe maker)
exeJ ("batch-like" executables creator for java applications)
JarToExe (a tool to convert jar files into EXE files)

Java class decompilers

Jad (Java Decompiler)
JadRetro (a Java decompiler helper supporting Java 1.5+ classes) [Maven artifact details]
JadClipse (a plug-in integrating Jad with Eclipse IDE)
IdeaJad (IntelliJ IDEA plugin for java class decompilation using Jad)
JadAlign (source aligner/reformatter for java files decompiled by Jad)
Jad mode for Emacs (Emacs integration with Jad)
JD-GUI (Yet another fast Java decompiler)
Procyon Java Decompiler (Open-source Java decompiler supporting Java 8)
JODE (Java Optimize and Decompile Environment)
CupOfJoe (a Java Decompiler supporting Java 5, disassembler and bytecode debugger)
javad (Java decompiler written in C++ aimed to decompile JDK v1.6 class files)
JDec (Java Decompiler)
"dcompiler" (JADO - Java Decompiler and Obfuscator)
debyte (a Java Decompiler)
JReversePro (Java Decompiler)
HBD (The HomeBrew Decompiler)
Sothink Java Decompiler (SourceTech Java decompiler)
Dava (Java Decompiler)
Java Clazz Utils (Java class files manipulation utility which includes Java classes viewer and decompiler)
Dedexer (a disassembler tool for Android DEX files)
dex2jar (Decompiler tools to work with Android .dex and java .class files)

Java class cross-version converters

Retroweaver (Java 1.5 to Java 1.4 class converter)
JadRetro (Java 1.5+ to Java 1.4 class converter targeting class decompilation)

Java source and code checkers

Jlint/AntiC (Java code checker)

Stand-alone Java source to byte code compilers

Jikes (IBM Java byte-code compiler)
KJC (Kopi Java Compiler)

Java assemblers

Jasmin (an assembler for the Java VM)

Java optimizers and obfuscators

ProGuard (Java class shrinker, optimizer, obfuscator)
jobfuscate (Duckware Java Class Obfuscator)
Zelix KlassMaster (Java byte-code optimizer and obfuscator)
yGuard (a free Java bytecode obfuscator and shrinker)
GuardIT for Java (an Interpreted Code Protection tool)
RetroGuard (a general-purpose Java obfuscator)
Allatori (a second-generation Java obfuscator)
DexGuard (specialized optimizer and obfuscator for Android)

Java properties converters

JPropJav (java properties to class source file converter) - part of JCGO

Java parser generators

JavaCC (Java Parser Generator)
Polyglot (Extensible Compiler Toolkit)
Coco/R (a multi-language LL(I) scanner/parser generator)
JFlex (Fast Scanner Generator for Java)
ANTLR (ANother Tool for Language Recognition - Parser Generator)

Java code analysis libraries

Soot (Java Optimization Framework)
BCEL (Byte Code Engineering Library)
Java ASM (Java byte-code manipulation framework)
libjit (a language-independent Just-In-Time compilation functionality implementation)

Stand-alone Java Runtime Standard Environment class libraries

GNU Classpath (Essential Libraries for Java) [development Git repo]
OpenJDK (Open-source "Java Development Kit")
Apache Harmony (Apache Open Source Java SE class library and VM)
Android libcore (Harmony-based core Java class library for Android)

OpenJDK integration projects

IcedTea (a harness to build OpenJDK using Free Software build tools)
openjdk4jikesrvm (bridge to use OpenJDK as JikesRVM class library)
CVMI (the OpenJDK Common Virtual Machine Interface)

Java class libraries for real-time systems

Javolution (Java library for real-time)

C++ libraries implementing Java API

NaJA (Native C++ Java-like API)

Pure Java CPU emulators

JPC (x86 PC emulator written in Java)
JZX (Java Z80 "ZX Spectrum" emulator)

Java stand-alone communication and network libraries

Sun/Oracle javacomm (Java Communication API) [comm-win32 download]
rxtx (native interface to serial ports in Java)
jUSB (a Java API for access to USB)
dnsjava (an implementation of DNS in Java)
IvmaiDNS tools (a pure java DNS client library and utilities for looking up the Internet domain names)

Java GUI libraries

Eclipse SWT (The Standard Widget Toolkit for Java)
SWTSwing (a port of the SWT graphical toolkit to Swing)
SwingWT (Swing and AWT API over SWT library)
IBM J9 WEME ppro10 UI (a standalone AWT implementation over SWT library)
Java-GNOME (Java bindings for GNOME and GTK libraries)
Qt Jambi (Qt library for Java)
QtAWT (Qt-AWT Java bindings for KDE)
KDEJava/Koala (Qt Java wrapper for KDE)
Escher (X-Window System library written in Java)
JCNIX (X-Window AWT CNI back-end)
PJA (Pure Java AWT back-end)
sdljava (Java bindings for Simple Direct Media Layer)
XTC (X-Window protocol implementation in Java)
GNU win32peer (Win32 AWT back-end for Classpath)
CHARVA (Java AWT for Text Terminals)
TUI AWT (a Text User Interface for the Java AWT)
XP Look and Feel (alternative Swing XP-like "look-and-feel")
LWUIT (a UI library for Java ME applications)
LWUIMB (a port of LWUIT on top of the MicroBackend library)
WeirdX (a pure Java X Window System Server implementation)

Java stand-alone miscellaneous libraries

JNA (Java library for accessing native shared/dynamic-link libraries with neither JNI nor native code required)
xFunction (a commercial library for DLL/shared libraries code invocation directly from Java without any JNI programming)
HSQLDB (a pure Java Database)
SqliteJDBC (a Java JDBC driver for SQLite)
Bouncy Castle Crypto (a lightweight cryptography API)
iText (a library generating PDF files)
JOrbis (a pure Java Ogg Vorbis decoder)
MicroEmulator (a pure Java ME implementation in Java SE)
Jar Class Loader (port of a configurable and dynamic custom classloader designed to create, manage and manipulate isolated Java classloaders)

JCGO: Java and C/C++ web developer resources

C/C++ compiler suites

C/C++ standard "LibC" library implementations

C/C++ stand-alone well-known libraries

C/C++ garbage collector libraries

Small C libraries partially implementing standard API

C/C++ stand-alone graphics libraries

Native executable packers and protectors

Archive (de)compression utilities

DOS extenders, drivers and DOS clones

Java VM with complete SDK suites

Stand-alone Java VM implementation

Java to native code "through C" static compilers

Direct Java to native code static compilers

Java-based PC Operating Systems

C code to Java translators

Multi-language translator suites

Java-to-exe wrappers

Java class decompilers

Java class cross-version converters

Java source and code checkers

Stand-alone Java source to byte code compilers

Java assemblers

Java optimizers and obfuscators

Java properties converters

Java parser generators

Java code analysis libraries

Stand-alone Java Runtime Standard Environment class libraries

OpenJDK integration projects

Java class libraries for real-time systems

C++ libraries implementing Java API

Pure Java CPU emulators

Java stand-alone communication and network libraries

Java GUI libraries

Java stand-alone miscellaneous libraries

Java build-automation tools

Java-based text editor tools

Java benchmarking

Some papers on Java

Java links collections