Tattle is a microwhistleblowing app; anonymous messaging geolocated to your neighborhood. It's very new and beta. [more inside]
Prevent intractable wars in the Middle East with this 1 weird old trick. Uses HTML5 geolocation and the Sunlight Labs congress API, which are both pretty rad tools.
This is a web application optimized for mobile devices that pulls realtime data from the MetroTransit.org municipal data feed in real time. If you're trying to catch the bus, you can find stations by full-text search, bookmark them and reload the page for live-updates of bus arrivals. It's made with Flask (a Python based web framework and Twitter Bootstrap a CSS framework). MTransit can also locate the closest bus stops to you via a geolocation API available in most browsers. It displays well on tablets, phones and good old browsers. [more inside]
Gratuities can be tricky: obligatory in some countries, but perceived as insulting in others. tipster.io aims to help travellers with an intuitive interface: devices and browsers that support geolocation receive tipping rates for their current location, while others can look up rates from a database of countries. [more inside]