I use the KDevelop IDE whenever I can. At SUSE mostly for reading code while debugging some bug. My plan is to create plugin that will show extra information inline with the code to make it easier to explore foreign code.

cscope is a great tool index C/C++ sources and allow to navigate through the code. I have learned that the project is mostly dead and what is worse it uses its own database format to store the index. I would like to see some extended functionality in the tool - e.g. search whether a function A is reachable from B, filtering search results per-file, fix functions with function parameter detection (such functions are not recognized properly currently) and some others.