In Frontier the equiv of an app is a Tool. They are arranged in the Tools menu. And if you're a tool writer, you can create a new tool with a command in the Tools menu.
From time to time I improve the code that creates tools to incorporate the latest standards. Instead of having to type the same stuff in each time I create one, I put it into the code that creates them, and then have less work to do when starting a new one.
Unless you're me, this probably won't have much significance.