Then for C++ you have Anjuta. I don't know if it is in the Software Portal (no time to see) but it is in Synaptic or here
From Anjuta site:
I find unbelievable it is still not part of GNOME! It is unbelievable they didn't bother to have an IDE such as Anjuta! (KDE/Qt developers have KDevelop as the official one, and some alternate choices, such as QDevelop, MonkeyStudio, Edyuk and even Eclipse.)Anjuta is a versatile Integrated Development Environment (IDE) for C and C++ on GNU/Linux. It has been written for GTK/GNOME and features a number of advanced programming facilities. These include project management, application wizards, an on-board interactive debugger, and a powerful source editor with source browsing and syntax highlighting.
Anjuta is an effort to marry the flexibility and power of text-based command-line tools with the ease-of-use of the GNOME graphical user interface. That is why it has been made as user-friendly as possible.
P.S: It's the same 'stupidity' for Glipper vs Klipper...
