GPS tech (Garmin, Hammerhead, Wahoo, RWGPS, etc)

RWGPS can do it manually or there's some online tools that do it.

I think I asked the same question in the GPS thread. This thread needs more merge. Or maybe it was this thread but I renamed it? I dunno.

How short do you want the stages, post it here and I will split it using garmins basecamp. This allows you to do it graphically.

You can use gpsprune. I've used it on Windows and Linux with success. It also lets you add additional markers for shops and stuff.