KDE Reuse Patterns Over 100 KDE applications were data mined to identify reuse patterns involving Qt/KDE classes. http://codeweb.sourceforge.net/cgi-bin/cw.pl?q=reuse-table:

The Reuse RKT Search and browse listings for more than 3000 open source applications, libraries, and functions. Includes links to C and Unix programmer's FAQs and other references. Man pages link directly to source code. http://www.rocketaware.com/orbit/Lo/