GNOME Builder is fast, clean & simple IDE for GTK application development (on Linux), integrated support for Git and easy possibility to publish the application on FlatHub. This is probably the best IDE for developing applications on Linux
Geany - Lightweight IDE for Linux and Windows
Microsoft Visual Studio - Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft
IntelliJ IDEA - Capable and Ergonomic IDE for JVM
Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...
Anjuta - Anjuta is a versatile Integrated Development Environment (IDE) for C and C++ on GNU/Linux.