There's a small utility for MS-Dos and Linux available at
http://www.racesimcentral.net/~kaltsi/
It's called 'gpldump' and dumps out laptime info out of
replay files. It can also display the speeds and distance
traveled by each driver through the whole replay.
Also gear used at each moment can be seen.
There's no graphical output, but you can use the numerical
data in a spreadsheet program to create cool race graphs
like these here:
http://www.racesimcentral.net/~speltone/phlegma/kappurat.html
Let me know if you find any use for it :-)
Cheers!
-Juha
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