This page will list Interactive Development Environments (IDE) that have been used with MinGW. Feel free to add one that you know as long as the IDE is fully open source. No partial functionality for free and full functionality for a fee products are to be listed on this page.
Code::Blocks IDE -- Code::Blocks is a free C++ IDE built to meet the most demanding needs of its users. It is designed to be very extensible and fully configurable.