Markdown Editor.
Markdown is a plain text language that uses simple syntax to enable renderers to display content as html. It is the result of work from John Gruber and has gain popularity as an easy way to keep journals, write articles and documentation.

Mapping Geotagged Photos.
Taking geotagged photos with a mobile phone or tablet if really easy. But how do you get those photos on a map? This app will create a comma-separated values (CSV) table from your geotagged photos and provide some quick tips for getting them on a map. Just as in the Photo Metadata Viewer below, no photos are metadata are copies to any server. This app uses the same client-side exif srcipt developed by Jacob Seidelin.

Photo Metadata Viewer.
Most digital cameras save JPEG images with metadata. This tool shows the metadata associated with an image taken with a digital camera. Not to worry, the photo and its metadata are not uploaded to any server. A client-side script does all the work. The srcipt was developed by Jacob Seidelin is available on GitHub.

Using the Geolocation API.
The Geolocation API Specification is a W3C Recommendation that provides access to a device’s geolocation through scripting. The API provides two methods for accessing a device’s geolocation and can be used for data collection that includes positional information in the form of latitude and longitude. While easy enough to implement, the API can be a bit challenging without a solid understanding of how it works. This article explains some of the less discussed aspects of using the Geolocation API in an effort toward a better implementation.