The LinCastor enables you to register your own custom URL scheme (e.g. mylink://foo/bar) and associate it with an application, shell, or AppleScript handler. As most OS X application support embedding links as part of a text, custom URL schemes provide a great way to connect different applications together or trigger custom workflows. For example: a link jira://issue1234 could open a JIRA tracker with specific issue. Another use is to associate well knows URL schemes with specific application. For example: firefox-http://www.mysite.net would open http://www.mysite.net in the Firefox instead of the default browser.
The Geo Trending app presents a list of countries in an order by how much they are mentioned in the news. You can browse the list and see the news. For each country, the app displays a circle indicating how often it's being mentioned at the present moment. The app uses the Vysoko News Analytics backend to fetch its data. With this app, you can see how current events correlate with news articles and how trends develop.