Fixgpxtime is a project mainly written in Python, it's free.
Adjusts timestamps in GPX files (in case your timestamps were a lie--ala RunKeeper's)
A little utility for adjusting the timestamps in GPX files.
RunKeeper is great for generating GPX logs of where you've been (eg, on a photowalk), but lies when it writes the timestamps. It uses the local time, formatted in a way that asserts it was UTC. But the next software down the line doesn't know that, trusts the UTC timestamps, and now you can't geotag your photos.
This fixes that.
Requires dateutil for convenience.
Crappy things that I'm too lazy to fix right now:
Pull requests welcome. :-)