Out-of-the-box server-side map marker clustering for django. Solves the "too many markers" problem and offers many features like filtering by category or different clustertypes (bubble, grid). Get the code at anycluster on github.
A common task is to make an app look the same across all displays. Unlike with responsive design, media queries cannot be used for this task. anyscreen measures the display dimensions that are available on any device and scales the apps design definitions (Apache Cordova, CSS) accordingly. You do not have to think about displays anymore. Get it on github.