Code::Blocks is a free cross platform IDE for C and C++ development. Code::Blocks has many useful features as well as being fully configurable by adding or creating plugins. In fact it even has a wizard for creating plugins using the free SDK.

Code::Blocks has support for multiple compilers and currently lists GCC (MingW / Linux GCC), MSVC++, Digital Mars, Borland C++ 5.5, Open Watcom.

Other features you would expect from a modern IDE include syntax highlighting, code folding, a tabbed interface and a class browser. For more features visitCode::Blocks website.