Otter 

Valgrind, a GPL'd tool to debug applications' memory allocation, is one of the most exciting profiling tools in the free software world. Think Purify, but free, easier and available for Linux. Now Josef Weidendorfer makes Valgrind even more attractive with the first unofficial release of KCachegrind, a KDE front-end for Valgrind's profiling tool. (Click for screenshots of basic use and a call tree graph.) Now all x86 Linux developers can benefit from a professional grade profiling tool! Read More