A free C, C++ and Fortran IDE
Rapid applications development tool and libraries for FPC
Open Source C & C++ IDE for Windows
IDLE Extensions
CodeLite: an open source, cross platform C/C++/PHP and JavaScript IDE
Electronic design and programming tools suite like Eagle, MpLab
A free, portable, fast and simple C/C++ IDE
A tiny and lightweight IDE for the Go programming language
Tools to support the learning of the C programming language
Graph algorithms interpreter, IDE, debugger, 3D visualizations.
The Scratch mod, Tiger