If you’re in a position where it makes practical and fiscal sense to create a new game, app or program that your audience could use, you could sweep up some new links in a variety of ways. For instance, an app that’s sold through the Apple store will give you a link, as well as reviews. This method of link-building will set you apart, but realize that it will also take some time. That means it should always be done in concert with other natural link-building methods.
There are many cost-effective ways to outsource rapid development of a simple app that really just boils down to 8-12 hours of a professional developer’s time.