C-Free

C-Free is a lightweight Integrated Development Environment (IDE) specifically focused on the C/C++ programming languages, primarily for the Windows platform.

Dev-Cpp

Dev-C++ (also written as Dev CPP) is a free Integrated Development Environment (IDE) designed specifically for the C and C++ programming languages.

Notepad Plus Plus

Notepad++ is a free and open-source code editor designed for Windows

Qt

Qt (pronounced "cute") is a powerful, cross-platform application and UI framework

gedit

gedit is a lightweight, open-source text editor for Linux (especially GNOME desktop).