dérive
Generate a heatmap from GPX data.
Drag and drop one or more GPX files into the window. No data is ever uploaded, everything is done client side.
Loosely inspired by The Passage Ride, which you should join if you ever find yourself in Los Angeles on any given Wednesday night.
http://library.nothingness.org/articles/SI/en/display/314
Strava
If you use Strava, go to your profile page and click "Download all your activities". You'll get an email containing a ZIP file of all the GPX files you've generated so far.
Getting started
# Install dependencies
$ npm install
# Develop locally
$ webpack-dev-server
# Build bundle
$ webpack -p