What's the best free C++ profiler for Windows?
CodeXL has now superseded the End Of Line'd AMD Code Analyst and both are free, but not as advanced as VTune.
There's also Sleepy, which is very simple, but does the job in many cases.
Note: All three of the tools above are unmaintained since several years.
Very Sleepy is a C/C++ CPU profiler for Windows systems (free).
Proffy is quite cool: http://pauldoo.com/proffy/
Disclaimer: I wrote this.