The title sums my question up pretty well: are there any open source OpenGL profilers for Linux?
The only thing I could find was gDEBugger, but it only comes with a 7 day trial and is very much closed source. I would use this for free (as in freedom) software development so paying is not an option, though I might consider accept answers for a free (as in beer) but closed application. Bonus points if it works with open source drivers (my main computer has an integrated Intel graphics card).
Have a look at BuGLe. Its main target is not profiling, but it has a filter, which shows the time spent in each OpenGL call.