There are so may softwares developed by C and C++ programming languages. Here we are list out those softwares list. Most of the critical softwares developed by C/C++. Even most of the operating systems are developed by C programmings. Mobile operating systems like IOS MeeGo are developed by C/C++ programming. All of these informations collected from Wikipedia.
Operating Systems

Os X Wiki Reference Source
Unix Wiki Reference Source
Linux Wiki Reference Source
Windows Wiki Reference Source

Mobile Operating System

iOS Wiki Reference Source
MeeGo Wiki Reference Source
Symbian Wiki Reference Source
Android Wiki Reference Source
Firefox OS Wiki Reference Source
Tizen Wiki Reference Source
Bada Wiki Reference Source

Adobe Softwares

Almost many other softwares by Adobe is developed with C/C++

PDF Reader Wiki Reference Source
Photoshop Wiki Reference Source
Dreamweaver Wiki Reference Source
Illustrator Wiki Reference Source
Flash Player Wiki Reference Source
Phonegap Wiki Reference Source
After Effects Wiki Reference Source
Fireworks Wiki Reference Source

Database Systems

These are some of the popular database. There are many more other DBMS developed with C/C++

Redis Wiki Reference Source
MS Sql Wiki Reference Source
MySql Wiki Reference Source
Oracle Wiki Reference Source

Browsers ( not complete, only the popular )

Opera Wiki Reference Source
Chrome Wiki Reference Source
Firefox Wiki Reference Source
Chromium Wiki Reference Source
Internet Explorer Wiki Reference Source

Programming Languages ( not complete, only the popular )

Perl Wiki Reference Source
Python Wiki Reference Source
PHP Wiki Reference Source
Lua Wiki Reference Source

MS Office Softwares Wiki

Word Wiki Reference Source
Excel Wiki Reference Source
PowerPoint Wiki Reference Source
Access Wiki Reference Source
Outlook Wiki Reference Source

Widget Toolkits ( not complete, only the popular )

wxWidgets Wiki Reference Source
GTK+ Wiki Reference Source
Qt Wiki Reference Source
Clutter Wiki Reference Source
MFC Wiki Reference Source

Websites ( not complete, only the popular )

Amazon.com Wiki Reference Source
Facebook.com Wiki Reference Source

Common Softwares

MS Visual Studio Wiki Reference Source
Windows Media Player Wiki Reference Source
VLC Media Player Wiki Reference Source
Wire Shark Wiki Reference Source
Doxygen Wiki Reference Source
WinSCP Wiki Reference Source
Fossil SCM Wiki Reference Source
Git SCM Wiki Reference Source