Introducing the Mozilla Location Service (experiment)
blog.mozilla.orgI work on this Mozilla project. If you have any questions, please ask!
Mozilla's network "stumbler" client is installable from GitHub: https://github.com/dougt/MozStumbler/releases. The client code is at https://github.com/dougt/MozStumbler/ and the server code is at https://github.com/mozilla/ichnaea/.
The client UI a little geeky now, but we have some gamification ideas akin to Google's Ingress or Nintendo's Treasure World games: