Last month, web developers young and old showed us what they could do with Geolocation in the September Dev Derby contest. After looking through the entries, our three expert judges–David Walsh, Joe Stagner and John Hammink–have decided on our top picks.

Not a contestant? There are many other reasons to be excited. Most importantly, all of these demos are completely open-source, making them wonderful lessons in the exciting things you can do with Geolocation today.

Winners

• First place: GoGeoTweet by newcomer Giovanny Andrés Góngora Granada
• Second place: Around the World by the always creative guska076
• Third place: Meet me there by August winner Patrick Wied

Runners-up

• Map My Day by Patrick Wied
• Neighborhood Hangouts by newcomer Massimiliano Marcon
• Geolocation love by sophomore Tomasz Kołodziejski

You may have noticed that Meet me there also ended in the top three last month. This marks a first for the Dev Derby. Because Patrick used both the Camera API and Geolocation in his demo, it was eligible for both contests. As if that weren’t interesting enough, this was one of the closest Derbies we have ever held, with GoGeoTweet and Around the World ending in a virtual photo finish.

Deciding on just a few winners is always difficult, so let’s not forget about our other amazing contestants. Every one of these participants has pushed this important mobile technology forward in ways we never imagined, and deserves a great deal of praise for doing so. I look forward to seeing what they create next.

Want to get a head start on an upcoming Derby? We are now accepting demos related to the CSS Media Queries (October), the Full Screen API (November) and offline technologies (December). Head over to the Dev Derby to get started.