The Xapian Project. Structure Synth. Software optimization resources. C++ and assembly. See also my blog Contents Optimization manuals.
Gprof2Dot - jrfonseca - Google Code. This is a Python script to convert the output from many profilers into a dot graph.
It has the following features: If you want an interactive viewer for gprof2dot output graphs, check xdot.py. Example This is the result from the example data in the Linux Gazette article with the default settings: