Code::Blocks (here) is an open-source, cross-platform IDE written using wxWidgets. Using a plugin architecture, its capabilities and features are defined by the provided plugins. Currently, Code::Blocks (http://www.codeblocks.org) is oriented towards C/C++. At the time of this writing, the following compilers are supported:

    * GNU GCC (http://gcc.gnu.org/) (Linux)
    * MinGW GCC (http://www.mingw.org) (Win32)
    * Microsoft's Visual C++ Free Toolkit 2003 (http://msdn.microsoft.com/visualc/vctoolkit2003) (Win32)
    * Borland's C++ Compiler 5.5 (http://www.borland.com/products/downloads/download_cbuilder.html#) (Win32)
    * DigitalMars (http://www.digitalmars.com/) (Win32)
    * OpenWatcom (http://store.scitechsoft.com/product_info.php?products_id=37/) (Win32)
    * Small Device C Compiler (SDCC) (http://sdcc.sourceforge.net/)
    * Intel C++ compiler (http://www.intel.com/cd/software/products/asmo-na/eng/compilers/219754.htm) (WARNING: requires manual configuration)

Features:
    * Open Source! GPL2, no hidden costs.
    * Cross-platform. Runs on Linux or Windows (uses wxWidgets).
    * Made in GNU C++. No interpreted languages or proprietary libs needed.
    * Comes in two presentations: Standalone, and MinGW bundle
    * Devpack support (optional)
    * Extensible thru plugins (SDK available in the downloads section)

Compiler-related features:

    * Multiple compiler support:
          o GCC (MingW / Linux GCC)
          o MSVC++
          o Digital Mars
          o Borland C++ 5.5
          o Open Watcom
    * Compiles directly or with makefiles
    * Predefined project templates
    * Custom template support
    * Uses XML format for project files.
    * Multi-target projects
    * Workspaces support
    * Imports MSVC projects and workspaces
         (NOTE: assembly code and inter-project dependencies not supported yet)
    * Imports Dev-C++ projects
    * Integrates with GDB for debugging

Interface Features:

    * Syntax highlighting, customizable and extensible
    * Code folding for C++ and XML files.
    * Tabbed interface
    * Code completion plugin
    * Class Browser
    * Smart indent
    * One-key swap between .h and .c/.cpp files
    * Open files list for quick switching between files (optional)
    * External customizable "Tools"
    * To-do list management with different users

And more! (See the forums for plugins currently being worked on)

Improvements from RC1-1 to RC2:

    * Precompiled headers (PCH) support! (currently works only with GCC)
    * The source is now fully UNICODE-compatible!
    * The source is also fully 64-bit compatible!
    * Autoconf/automake build system is now used for non-windows platforms.
    * New plugins:
          o Code statistics: counts nr. of source lines, nr. of comment lines, etc.
          o CBProfiler: parses and displays the output of GProf, the GNU Profiler.
          o SourceExporter: exports the active file to HTML/RTF/ODT.
    * New lexer (syntax highlighting) files:
          o Fortran77 (by Martin Halle)
          o NVidia CG (by anonymous)
          o X-Base languages (Clipper, Foxpro)
    * New and improved project templates:
          o SDCC program
          o Irrlicht 3D Graphics Engine
          o Ogre 3D Graphics Engine
          o GLFW project (OpenGL FrameWork)
          o wxWidgets: selection between static/dynamic unicode/ansi wxWidgets version.
    * New editor functionality (by right-clicking the editor):
          o "Find declaration of [keyword]"
          o "Open #include file: [file]"
    * New plugin type: cbProjectWizardPlugin to allow creation of custom new-project wizards.
    * New compiler supported: SDCC (Small Device C Compiler - http://sdcc.sourceforge.net/) for micro-processors. Contributed by Stanimir Jordanov.
    * Better handling of modified files outside the IDE: r/w->r/o, r/o->r/w, deletion
    * Single file (without project) compilation is now supported, for quick tests.
    * Code::Blocks now allows multiple files selection when adding link libraries.
    * BCC compiler is now working correctly for DLLs and static libraries.
    * Find-in-Files supports searching in arbitrary paths/filemasks (outside of project).
    * All Code::Blocks internal file formats (project, workspace, etc) are now valid XML.
    * Many new editor settings.
    * Many other bug-fixes.