Non-text development environments

Kdevelop and KDE studio: IDEs which are part of KDE
Sniff+: source code analysis tool, a commercial product by WindRiver http://www.windriver.com
C-Forge IDE: free (fewer features) or $50 full version http://www.codeforge.com
Metrowerks CodeWarrior: commercial IDE $150 http://www.metrowerks.com

Kdevelop and KDE studio: IDEs which are part of KDE