Sirkel is a project mainly written in JAVASCRIPT and RUBY, it's free.
Geolocation-based chat app
Sirkel is a geolocation based chat application that won VMware's Flings Contest among all interns in the Americas. It was built in 3 weeks using Rails, Cloud Foundry & Pushr App.
Because it was built in 3 weeks, there are bugs, so please just use this as a (very)rough reference.