Running a retail business is no walk in the park; many aspects of the business demand your attention. However, selecting and maintaining a point of sale system shouldn't be one of them. A simple point of sale system should include some of the basic features, like inventory and register, and run without much intervention. When a point of sale system is free or low-cost, it becomes even more attractive.
Here are five free point of sale apps for the web and desktop.
Note: This gallery is also available as an article.